Alpha AlphaCell SMU-HR Series User manual

AlphaCellTM SMU-HR Series Batteries
Technical Manual
Effective: July 2010

3
745-680-B2-002, Rev. B
AlphaCellTM SMU-HR Series Batteries
Technical Manual
745-680-B2-002, Rev. B
Effective Date: July, 2010
Copyright © 2010
Alpha Technologies, Inc.
Contacting Alpha Technologies: www.alpha.com
OR
For general product information and customer service (7 AM to 5 PM, Pacic Time), call
1-800-863-3930,
For complete technical support, call
1-800-863-3364
7 AM to 5 PM, Pacic Time or 24/7 emergency support
member of The Group
TM
NOTE:
Photographs contained in this manual are for illustrative purposes only. These photographs may not match
your installation.
NOTE:
Operator is cautioned to review the drawings and illustrations contained in this manual before proceeding. If
there are questions regarding the safe operation of this product, please contact Alpha Technologies or your
nearest Alpha representative.
NOTE:
Alpha shall not be held liable for any damage or injury involving its enclosures, power supplies, generators,
batteries, or other hardware if used or operated in any manner or subject to any condition not consistent with
its intended purpose, or is installed or operated in an unapproved manner, or improperly maintained.

745-680-B2-002, Rev. B
4
Table of Contents
Safety Notes.......................................................................................................................... 6
1.0 Introduction................................................................................................................. 8
1.1 Features........................................................................................................... 8
1.2 Typical Electrical and Mechanical Specications............................................. 9
1.3 Operating Conditions ....................................................................................... 9
1.4 Capacity........................................................................................................... 9
1.5 Temperature and Battery Life......................................................................... 10
1.6 Internal Resistance and Short-circuit Current................................................ 10
2.0 Charging Procedures.................................................................................................11
2.1 Float Charge ...................................................................................................11
2.2 Recharge Following Discharge...................................................................... 12
3.0 Storage ..................................................................................................................... 13
4.0 Maintenance ............................................................................................................. 15
4.1 Recommended Maintenance Tasks............................................................... 15
5.0 Discharge Specications .......................................................................................... 17
5.1 Discharge Data with Constant Current .......................................................... 17
5.2 Discharge Data with Constant Power ............................................................ 19
6.0 Forms ........................................................................................................................21
6.1 Discharge Recording Form............................................................................ 21

5
745-680-B2-002, Rev. B
Figures
Fig. 1-1, Available Capacity vs. Ambient Temperature .......................................................... 9
Fig. 2-1, Recharge Time and Capacity Restored as Function of Current Limit ................... 13
Fig. 3-1, Capacity vs. Storage Time .................................................................................... 14
Fig. 4-1, VRLA Battery Regular Maintenance Record ......................................................... 16
Table 1-1, General Electrical and Mechanical Specications by Model ................................ 8
Table 1-2, Internal Resistance and Short Circuit Current at 77ºF (25ºC).............................10
Table 2-1, Float Voltage at Different Temperatures ..............................................................11
Table 2-2, Boost Charge Intervals ....................................................................................... 13
Tables

745-680-B2-002, Rev. B
6
Safety Notes
Review the drawings and illustrations contained in this manual before proceeding. If there are any questions
regarding the safe installation or operation of the system, contact Alpha Technologies or the nearest Alpha
representative. Save this document for future reference.
To reduce the risk of injury or death, and to ensure the continued safe operation of this product, the following
symbols have been placed throughout this manual. Where these symbols appear, use extra care and
attention.
The use of ATTENTION is only for specic regulatory/code requirements that may affect the placement of
equipment and installation procedures.
ATTENTION:
NOTE:
A NOTE gives readers additional information to help them complete a specic task or procedure.
CAUTION!
The use of CAUTION indicates safety information intended to PREVENT DAMAGE to material or
equipment.
WARNING!
A WARNING presents safety information to PREVENT INJURY OR DEATH to the
technician or user.

7
745-680-B2-002, Rev. B
Chemical Hazards
Any gelled or liquid leakage from a valve-regulated lead-acid (VRLA) battery contains dilute sulfuric acid,
which is harmful to the skin and eyes. Emissions are electrolytic, and are electrically conductive and
corrosive.
To avoid injury:
Servicing and connection of batteries shall be performed by, or under the direct supervision of, personnel•
knowledgeable of batteries and the required safety precautions.
Always wear eye protection, rubber gloves, and a protective vest when working near batteries. Remove all metallic•
objects from hands and neck.
Batteries produce explosive gases. Keep all open ames and sparks away from batteries.•
Use tools with insulated handles, do not rest any tools on top of batteries.•
Lead-acid batteries contain or emit chemicals known to the State of California to cause cancer and birth defects or•
other reproductive harm. Battery post terminals and related accessories contain lead and lead compounds. Wash
hands after handling (California Proposition 65).
Wear protective clothing (insulated gloves, eye protection, etc.) when installing, maintaining, servicing, or replacing •
batteries.
If any battery emission contacts the skin, wash immediately and thoroughly with water. Follow your company’s•
approved chemical exposure procedures.
Neutralize any spilled battery emission with the special solution contained in an approved spill kit or with a solution•
of one pound bicarbonate of soda to one gallon of water. Report a chemical spill using your company’s spill reporting
structure and seek medical attention if necessary.
Always replace batteries with those of an identical type and rating. Never install old or untested batteries.•
Do not charge batteries in a sealed container. Each individual battery should have at least 0.5 inches of space•
between it and all surrounding surfaces to allow for convection cooling.
All battery compartments must have adequate ventilation to prevent accumulation of potentially dangerous gas.•
Ventilation should prevent trapped hydrogen gas pockets from exceeding a 1% concentration as per regulation 70E
of the National Fire Protection Agency (NFPA).
Prior to handling the batteries, touch a grounded metal object to dissipate any static charge that may have developed•
on your body.
Never use uninsulated tools or other conductive materials when installing, maintaining, servicing, or replacing•
batteries.
Use special caution when connecting or adjusting battery cabling. An improperly connected battery cable or an•
unconnected battery cable can make contact with an unintended surface that can result in arcing, re, or possible
explosion.
A battery showing signs of cracking, leaking, or swelling should be replaced immediately by authorized personnel•
using a battery of identical type and rating.
Battery Safety Notes
Equipment Cautions
Do not operate NiCd and lead-acid batteries in the same room. NiCd emissions will neutralize the lead-acid solution,•
rendering the battery useless.
Overcharging the battery can result in a loss of capacity and excess release of gas.•
Recycling and Disposal Instructions
Spent or damaged batteries are considered environmentally unsafe. Always recycle used batteries or dispose of the
batteries in accordance with all federal, state and local regulations.
WARNING!
Lead-acid batteries contain dangerous voltages, currents and corrosive material. Battery
installation, maintenance, service and replacement must be performed only by authorized
personnel.

745-680-B2-002, Rev. B
8
Table 1-1, General Electrical and Mechanical Specications by Model
(Specications courtesy of manufacturer)
Type
Normal
Voltage
(V)
Rated
Capacity
C20 (Ah)
Rated Power
(15min, 1.67V,
W)
Dimensions Weight
L
(in/mm)
W
(in/mm)
H
(in/mm) (lb/kg)
SMU-HR 12-9 12 9.0 35.0 5.9/151 2.6/65 4.0/101 5.9/2.7
SMU-HR 12-18 12 20.4 75.0 7.1/181 3.0/77 6.6/167 13.2/6.0
SMU-HR 12-35 12 35.0 140 7.7/195 5.1/130 7.1/180 24.3/11.0
SMU-HR 12-55 12 55.0 198 9.0/228 5.5/139 8.9/225 38.6/17.5
SMU-HR 12-75 12 75.0 270 10.3/261 6.8/173 8.8/224 57.3/26.0
SMU-HR 12-90 12 92.0 310 12.0/305 6.6/168 8.4/212 63.7/28.9
SMU-HR 12-100 12 100 397 13.4/341 6.8/173 9.5/241 75.0/34.0
SMU-HR 12-150 12 154 461 19.1/485 6.8/172 9.5/240 99.2/245.0
The SMU-HR series of Valve Regulated Lead Acid (VRLA) batteries is designed to meet the needs
of many industrial and utility applications. The success of the AlphaCell SMU-HR series is due to a
product design purpose-built for the needs of critical backup requirements, and an industry-leading
manufacturing technology which delivers product consistency. Safety, reliability, and long service life
in standby applications are the result.
Alpha offers a full line of racking solutions to accommodate the SMU-HR series of batteries. SMU-HR
batteries provide easy terminal access for installation and maintenance, and can be upright-, side-, or
end-mounted. The SMU-HR series includes eight models to make it easier to install and maintain the
batteries.
1.1 Features
Require no additional water throughout their life cycle, reducing maintenance costs.•
Specically designed to meet the requirements of modern electronic equipment. •
Compatible with commonly available recharging systems.•
Compact construction and excellent performance at high rates of discharge provide big•
savings in volume and weight compared to conventional vented batteries.
SMU-HR batteries offer substantial savings in installation and maintenance costs•
compared to conventional vented batteries. No specically designed rooms are required
and only minimal maintenance is needed during the life of the battery.
SMU-HR batteries are very easy to maneuver. Smaller, more compact, and lighter than•
traditional batteries, SMU-HR batteries are supplied lled and charged so they can be
immediately installed directly into cabinets or on easily assembled racks (also available
from AlphaCell).
With a minimum 10 year design life, the SMU-HR batteries are highly reliable and fully•
comply with established international standards. The SMU-HR range has been fully
tested with respect to charge and discharge characteristics, cycle life, recombination
efciency, mechanical strength, vibration life, and ame retardancy.
1.2 TypicalElectricalandMechanicalSpecications
1.0 Introduction

9
745-680-B2-002, Rev. B
1.3 Operating Conditions
Because SMU-HR batteries, which are valve regulated and virtually sealed, do not give off
perceptible amounts of gas under normal operating conditions, they can be installed in the
same environment where people live and work.
Acceptable ambient operating temperature: -40ºF to 131ºF (-40ºC to 55ºC)•
Ideal ambient operating temperature: 68ºF to 77ºF (20ºC to 25ºC)•
Ambient humidity: ≤ 95%•
Operating room or area: ventilated and not fully sealed•
1.4 Capacity
Battery capacity is rated in Ampere hours (Ah) and is the quantity of electricity that can be
supplied during discharge (See Table 1-1).
The actual capacity is related to the utilization ratio of the active positive and negative
materials within the battery. The utilization ratio is inuenced by the depth of discharge, the
structure of the battery, and the manufacturing technology. During normal usage, the factors
that inuence the actual capacity are discharge rate, depth of discharge, end voltage, and
temperature.
The higher the discharge rate, the lower the available capacity.•
As batteries get colder, the available capacity is reduced. This is related to the kinetics of•
the electrochemical reactions and the resistivity of the electrolyte (See Fig. 1-1).
NOTE:
Although the battery can be operated at temperatures below 5ºF (-15ºC), the capacity and ability to
discharge will be dramatically decreased. Similarly, temperatures approaching 122ºF (50ºC) will increase
water loss and corrosion of the plates, resulting in a shorter battery life.
1.0 Introduction, continued
Fig. 1-1, Available Capacity vs. Ambient Temperature
Capacity (%)
Ambient Temperature (ºC)
-40-30 -20-10 0102030405060
0
20
40
60
80
100

745-680-B2-002, Rev. B
10
1.5 Temperature and Battery Life
High temperatures can harm the battery and reduce its lifespan. Battery life decreases by
50% every per 15ºF (~ 9ºC) above the standard operating temperature of 77ºF (25ºC).
To minimize battery damage:
Use temperature compensated chargers.•
Never allow the battery's temperature to exceed +131ºF (+55°C).•
Make sure operating area is properly ventilated, so heat cannot accumulate.•
Provide at least 0.39" (10mm) of space between batteries to enhance convective cooling.•
Visit sites annually to check for shorted cells, improperly set voltages, lter cleaning on •
ventilation systems, etc.
1.6 Internal Resistance and Short-circuit Current
The internal resistance of the battery is affected by temperature and charge state. The
internal resistance is lowest when the battery is fully charged.
Table 1-2, Internal Resistance and Short Circuit Current at 77ºF (25ºC)
Type InternalResistance(mΩ) Short Circuit Current (A)
SMU-HR 12-9 32.4 370
SMU-HR 12-18 15.0 800
SMU-HR 12-35 10.0 1239
SMU-HR 12-55 8.50 1498
SMU-HR 12-75 6.50 1959
SMU-HR 12-90 5.20 2442
SMU-HR 12-100 5.22 2247
SMU-HR 12-150 4.14 3072
CAUTION!
A short circuit current will decrease the voltage of the battery to 0V, and damage the internal
components.
1.0 Introduction, continued

11
745-680-B2-002, Rev. B
NOTE:
Refer to your particular charger’s manual for specic instructions regarding charger setup and operation.
2.0 Charging Procedures
During operation, verify batteries are:
Float-charged in order to maintain a fully charged condition during the standby period.•
Completely recharged after a discharge. Recharge as soon as possible to ensure maximum•
protection against subsequent power outages. Early recharge also ensures maximum battery
life.
While recharging procedures vary depending on the recharge time and battery life, generally charging
is performed as follows:
At a voltage equal to the oat voltage and a low current (long recharge time); •
At a voltage not higher than 2.4Vpc and a high current (faster recharge). •
The IU recharge method, also known as modied constant potential, has been used for many years
and in a variety of applications. It satises the need to have the battery quickly recharged while
ensuring maximum battery life.
Recharge at a constant current rate until the voltage reaches a pre-set value.1.
Maintain the pre-set voltage and decrease the current until a minimum dened value is 2.
reached.
Complete the recharge at a nal constant voltage value equal to or less than that dened for 3.
oat charge and decrease the current to the value used in oat.
Temperature °F (°C) Recommended Float (Vpc)
-4 (-20) 2.37
32 (0) 2.32
68 (20) 2.27
77 (25) 2.26
140 (60) 2.17
2.1 Float Charge
2.27V at 68°F (20°C) is the recommended voltage for oat charge. This voltage ensures the
maximum life of SMU-HR batteries. These batteries can operate over a temperature range of -4°F
(-20°C) to +140°F (+60°C). Performance and life are greatly reduced outside of this temperature
range.
The equation to determine oat voltage at a given temperature is:
V = 2.32 - 0.0025 * T (where V= Float Voltage and T = Temperature)
or
-2.5 mV per 1.8F (1C) temperature uctuation outside of 68F (20C)
The minimum and maximum recommended voltages are 0.010V on either side of the determined
voltage at a given temperature. Batteries oated at voltages above the range will have an increased
risk of dry out, grid corrosion and thermal runaway. Batteries oated below the range will not receive
enough charge, and will be subject to sulfation.
Table 2-1, Float Voltage at different Temperatures

745-680-B2-002, Rev. B
12
2.1 Float Charge, continued
Float Current
The normal oat current observed in fully charged SMU-HR batteries at 2.27Vpc at a
temperature of 68F (20C) is approximately 30mA per 100Ah. Because of the nature of
recombination phenomena, the oat current observed in SMU-HR batteries is normally higher
than that of vented batteries and is not an indication of the state of charge of the batteries.
Thermal Runaway
Float current is primarily a function of voltage and temperature. As either voltage or
temperature increases, the oat current also increases exponentially. Much of the oat
current is going into the recombination reaction, which is exothermic. If the heat generated by
recombination exceeds the rate at which heat can be transferred out of the battery (based on
conduction, convection, and black body radiation), thermal runaway can occur. The battery
will continue to take very large amounts of current from the rectier and excessive gassing
and overheating will result.
2.2 Recharge Following Discharge
Recommended Charge
The recommended recharge method to maximize battery life is to charge with a constant
voltage equal to the oat charge voltage (2.27Vpc at 68F (20C)) (see Table 2-1) and a
maximum charge current of 0.25 C8 amperes.
Fast Charge
If it is necessary to reduce the recharge time, charge with a maximum voltage of 2.4Vpc at
68F (20C) and a maximum current of 0.25 C8(use the temperature adjustment formula in
section 3.1 for voltage adjustment). This recharge should be used no more than once per
month to maximize the service life of the battery.
WARNING!
In the most severe cases of thermal runaway, equipment can be damaged by sulfuric acid mist that escapes
the battery, hydrogen can build up to dangerous levels, and battery cases can rupture because of weakening
and melting of the plastic. Ruptured cases can lead to ground faults.
To minimize the risk of thermal runaway:
1. Use temperature compensated chargers1.
2. Never allow the batteries to exceed 131F (55C)2.
3. Make sure cabinets are properly ventilated3.
4. Provide spacing between batteries to enhance convective cooling4.
5. Visit sites annually to check for shorted cells, improperly set voltages, lter cleaning on
ventilation 5. systems, etc.
WARNING!
Avoid situations where excess current is available to recharge the battery. This can occur when the DC load
is low relative to the charger or maximum rectier output, and the battery is fully discharged. If too much
current enters the battery, the battery can heat up excessively, be permanently damaged, or may cause an
explosion.

13
745-680-B2-002, Rev. B
2.2 Recharge Following Discharge, continued
Using a current limit of 0.1 C10, it takes approximately 9 hours to restore 80% of the
discharge, and 11 hours to restore 90%. This can be compared to a current limit of 0.25 C10,
whereby 80% is returned in approximately 4 hours, and 90% within 5 hours.
3.0 Storage
Open circuit
When a battery is stored in an open circuit, two major things occur:
1 Sulfate leaves the electrolyte and reacts with the plates, causing a reduction in the charge
state of the battery.
2. Grid corrosion accelerates, especially when the open circuit voltage of the battery is allowed
to go below 2.05Vpc.
The state of charge of lead acid batteries slowly decreases in an open circuit due to self-discharge. In
SMU-HR batteries, the rate of self-discharge is about 23% per month at 77F (25C). During prolonged
storage it is necessary to boost-charge the battery at least every 6 months to maintain a fully charged
condition of the battery (see Section 2.2). Excessive open circuit storage of any lead acid battery
without recharge will result in a permanent loss of capacity. When stored at higher temperatures, the
boost interval should be more frequent. Keep the open circuit voltage (measured in a fully rested state
of at least 16 hours) at or above 2.05Vpc to minimize the amount of irreversible grid corrosion.
Fig. 2-1, Recharge Time and Capacity Restored as a Function of Current Limit
While less charger (rectier) amps means a longer recharge time, too many charger (rectier) amps can
damage the battery.
NOTE:
Table 3-1, Boost Charge Intervals
0.1C10
0.1C5
0.2C5
0246810 12 14 16
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
110%
Storage Temperature °F (°C) Boost Interval
77 (25) 6 Months
95 (35) 3 Months
113 (45) 1 Month
Hours
Capacity

745-680-B2-002, Rev. B
14
3.0 Storage, continued
All lead acid batteries experience self-discharge while in open circuit storage. This causes circuit
voltage and capacity to decrease (see Fig. 3-1).
During storage please note:
The self-discharge rate is related to ambient temperature. The lower the temperature, the less•
the discharge. Batteries should be stored in a clean, ventilated, and dry location with an ambient
temperature of 32ºF to 95ºF (0ºC to 35ºC).
It is important to track open circuit voltage which is related to the density of the electrolyte. If the•
open circuit voltage is lower than 12.6V/block, or the batteries have been stored for three months,
the batteries should be charged to avoid damage caused by self-discharge.
All batteries should be fully charged before storage. Record the storage date and next•
supplemental charge date in a maintenance record (See Fig. 4-2).
32ºF (0ºC)
50ºF (10ºC)
68
ºF
(2
0
º
C
)
8
6ºF (
3
0ºC
)
1
0
4ºF
(
40
º
C)
Residual Capacity (%)
Storage Time (Months)
Fig. 3-1, Capacity vs. Storage Time

15
745-680-B2-002, Rev. B
4.1 Recommended Maintenance Tasks
In order to prolong battery life, perform regular maintenance and inspections.
Monthly Maintenance
Keep the batteries and battery room clean.•
Measure and record the ambient temperature of the battery-room.•
Check for damage and overheating evidence on the terminal, container, and lid.•
Measure and record the total voltage and oating current of the battery system.•
Quarterly Maintenance
Measure and record the oating voltage of every on-line battery. If the voltage of
more than two cells is less than 13.0V after temperature adjustment, discharge the
battery and then recharge at the oat rate. If the problem still exists, conduct yearly
or three-year maintenance procedures. If the problem persists, please contact Alpha
Technologies.
Yearly Maintenance
Check for loose connections.•
Conduct a discharge test to check the exact load, discharging 30-40% of the•
rated capacity.
Three-Year Maintenance
After three years of operation, conduct an 80% capacity test annually.
4.0 Maintenance

745-680-B2-002, Rev. B
16
Fig. 4-1, VRLA Battery Regular Maintenance Record
No. Voltage (V) No. Voltage (V)
1 13
2 14
3 15
4 16
5 17
6 18
7 19
8 20
9 21
10 22
11 23
12 24
Visual check:
Type: Place:
Test Status: Qty:
Total Voltage (V): Room Temperature:
Current (A):
4.0 Maintenance, continued

17
745-680-B2-002, Rev. B
SMU-HR 12-35
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 165 103 77.6 47.4 23.5 10.3 6.29 3.43 1.85
1.67V 155 97.6 74.7 45.3 23.1 9.90 6.16 3.39 1.79
1.70V 142 94.1 72.9 41.2 22.4 9.24 6.03 3.38 1.76
1.75V 139 91.2 70.6 39.1 21.4 8.93 5.90 3.37 1.71
1.80V 125 87.1 64.1 36.2 20.0 8.58 5.54 3.30 1.67
1.85V 110 82.9 57.6 33.4 18.7 8.27 5.19 3.26 1.64
SMU-HR 12-55
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 177 122 97.0 62.5 38.8 15.5 10.0 5.44 2.90
1.67V 173 121 92.0 60.0 38.5 15.4 9.80 5.12 2.85
1.70V 173 121 90.0 60.0 38.5 15.4 9.70 5.12 2.80
1.75V 172 121 89.0 60.0 38.5 15.3 9.70 5.12 2.75
1.80V 163 117 88.0 58.7 37.5 15.3 9.70 4.96 2.70
1.85V 153 110 85.0 56.7 35.8 14.7 9.50 4.75 2.60
5.1 Discharge Data with Constant Current
Amperage values for each battery model as a function of time and voltage @ 77°F/25°C.
5.0 DischargeSpecications
SMU-HR 12-9
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 41.4 25.7 19.4 11.8 5.69 2.50 1.53 0.83 0.48
1.67V 38.8 24.4 18.7 11.3 5.61 2.40 1.49 0.82 0.46
1.70V 35.6 23.5 18.2 10.3 5.44 2.24 1.46 0.82 0.45
1.75V 34.9 22.8 17.6 9.78 5.18 2.17 1.43 0.81 0.44
1.80V 31.2 21.8 16.0 9.06 4.85 2.08 1.34 0.80 0.43
1.85V 27.5 20.7 14.4 8.34 4.52 2.01 1.26 0.78 0.42
SMU-HR 12-18
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 88.6 55.1 41.6 25.4 14.2 6.24 3.81 2.08 1.12
1.67V 83.2 52.3 40.0 24.3 14.0 6.00 3.73 2.06 1.08
1.70V 76.2 50.4 39.1 22.1 13.6 5.60 3.65 2.05 1.07
1.75V 74.7 48.8 37.8 21.0 13.0 5.41 3.57 2.04 1.04
1.80V 66.9 46.6 34.3 19.4 12.1 5.20 3.36 2.00 1.01
1.85V 59.0 44.4 30.9 17.9 11.3 5.01 3.15 1.97 0.99

745-680-B2-002, Rev. B
18
SMU-HR 12-75
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 196 136 105 77.0 49.5 23.3 14.8 7.50 3.83
1.67V 192 135 103 76.0 49.2 23.1 14.7 7.40 3.80
1.70V 192 135 103 76.0 49.2 23.0 14.6 7.40 3.78
1.75V 190 135 103 76.0 49.0 23.0 14.4 7.30 3.75
1.80V 188 135 103 75.0 47.0 22.5 14.0 7.20 3.70
1.85V 175 123 99.0 67.5 45.8 20.7 14.0 7.10 3.65
SMU-HR 12-90
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 366 228 172 105 65.4 28.7 17.5 9.55 5.16
1.67V 344 216 165 100 64.5 27.6 17.2 9.46 4.98
1.70V 315 208 162 91.2 62.6 25.8 16.8 9.42 4.90
1.75V 309 202 156 86.6 59.6 24.9 16.4 9.39 4.78
1.80V 276 193 142 80.2 55.8 23.9 15.5 9.20 4.65
1.85V 244 184 128 73.9 52.0 23.1 14.5 9.07 4.52
SMU-HR 12-100
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 320 218 180 114 75.0 30.0 19.1 10.0 5.25
1.67V 290 215 173 113 74.0 29.7 18.9 9.90 5.20
1.70V 280 213 172 113 73.0 29.5 18.7 9.80 5.07
1.75V 275 212 170 112 72.0 29.0 18.5 9.80 5.00
1.80V 250 208 168 110 70.0 28.5 18.3 9.70 4.85
1.85V 228 200 164 103 68.0 27.9 18.0 9.70 4.80
SMU-HR 12-150
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 525 360 263 158 99.0 41.0 28.6 15.9 7.91
1.67V 473 329 255 153 98.9 40.8 28.4 15.7 7.88
1.70V 449 317 246 150 98.6 40.8 28.4 15.5 7.88
1.75V 399 293 233 147 97.5 40.5 28.2 15.3 7.84
1.80V 360 272 222 143 96.3 40.4 27.9 15.0 7.56
1.85V 273 224 192 131 95.3 40.2 27.7 14.7 7.11
5.1 Discharge Data with Constant Current, continued

19
745-680-B2-002, Rev. B
SMU-HR 12-9
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 72.6 46.5 35.4 21.3 10.3 4.43 2.58 1.71 0.95
1.67V 70.0 45.3 35.0 20.9 10.2 4.29 2.57 1.70 0.92
1.70V 66.4 44.9 34.7 19.6 10.0 4.10 2.53 1.69 0.91
1.75V 65.9 44.7 34.4 19.0 9.83 4.00 2.51 1.65 0.88
1.80V 60.7 44.0 31.9 18.1 9.27 3.88 2.43 1.60 0.86
1.85V 55.1 41.8 28.9 16.9 8.71 3.77 2.36 1.56 0.83
SMU-HR 12-18
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 156 99.6 75.9 45.7 25.7 11.1 6.44 4.27 2.24
1.67V 150 97.1 75.0 44.7 25.5 10.7 6.42 4.24 2.16
1.70V 142 96.1 74.4 41.9 25.0 10.2 6.33 4.21 2.13
1.75V 141 95.8 73.7 40.7 24.6 10.0 6.28 4.16 2.08
1.80V 130 94.4 68.4 38.8 23.2 9.71 6.08 4.11 2.06
1.85V 118 89.5 62.0 36.3 21.8 9.41 5.89 4.05 2.03
5.2 Discharge Data with Constant Power
Wattage values for each battery model as a function of time and voltage with constant Watts
per cell @ 77°F/25°C.
SMU-HR 12-35
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 290 186 142 85.3 42.3 18.3 10.6 7.04 3.70
1.67V 280 181 140 83.5 42.1 17.7 10.6 7.00 3.56
1.70V 265 179 139 78.2 41.3 16.9 10.5 6.95 3.52
1.75V 264 179 138 75.9 40.6 16.5 10.4 6.86 3.43
1.80V 243 176 128 72.4 38.2 16.0 10.0 6.70 3.36
1.85V 220 167 116 67.8 35.9 15.5 9.72 6.56 3.30
SMU-HR 12-55
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 385 257 203 125 74.1 31.4 20.3 11.2 5.87
1.67V 373 253 198 124 73.7 31.3 20.2 11.1 5.82
1.70V 360 252 197 124 73.6 31.2 20.1 11.0 5.77
1.75V 353 245 194 123 73.3 31.1 19.8 10.9 5.71
1.80V 345 239 191 122 72.6 30.9 19.5 10.8 5.66
1.85V 327 224 152 114 68.2 28.5 17.7 10.4 5.45

745-680-B2-002, Rev. B
20
SMU-HR 12-75
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 537 368 284 181 108 49.7 33.3 16.2 7.91
1.67V 512 359 270 178 106 46.3 32.0 16.0 7.88
1.70V 500 350 268 177 105 45.7 31.3 15.8 7.88
1.75V 484 342 265 172 103 45.0 30.8 15.8 7.84
1.80V 470 330 263 162 103 43.3 30.0 15.7 7.56
1.85V 420 300 258 158 102 42.5 28.7 15.0 7.37
SMU-HR 12-90
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 643 412 314 189 118 50.9 29.6 19.6 10.3
1.67V 620 401 310 185 117 49.3 29.5 19.5 9.94
1.70V 588 397 307 173 115 47.1 29.1 19.4 9.81
1.75V 584 396 305 168 113 46.0 28.9 19.1 9.57
1.80V 538 390 283 160 107 44.7 28.0 18.9 9.32
1.85V 488 370 256 150 100 43.3 27.1 18.6 8.95
SMU-HR 12-100
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 740 518 405 254 154 58.0 43.3 23.7 10.5
1.67V 714 505 397 253 153 57.7 43.2 23.3 10.5
1.70V 700 496 390 253 152 57.7 43.2 23.2 10.5
1.75V 662 475 378 245 152 57.5 43.0 23.2 10.5
1.80V 594 462 369 240 150 57.2 42.7 23.0 10.2
1.85V 560 441 358 230 146 56.3 41.5 22.7 9.90
SMU-HR 12-150
End voltage 5Min 10Min 15Min 30Min 1h 3h 5h 10h 20h
1.60V 866 597 465 297 195 78.6 54.8 31.8 15.8
1.67V 821 590 461 291 189 78.6 54.8 31.3 15.8
1.70V 767 575 453 284 184 78.6 54.8 31.1 15.8
1.75V 714 537 426 276 182 77.4 54.2 30.6 15.7
1.80V 641 500 401 269 179 76.4 53.3 30.0 15.1
1.85V 513 414 350 246 177 76.1 52.5 29.5 14.2
5.2 Discharge Data with Constant Power, continued