Gacell CT-3800 User manual

Battery Charger User Guide
MODEL: CT-3800
AC Input: 220-240VAC, 50-60Hz, 0.8A
DC Output: 6VDC, 3.5A;
12VDC, 3.5A;
12VDC, 1A;
Temperature Controlled
Please read and understand all important safety and operating
instructions before using this charger. In addition, please read and follow
all battery and vehicle manufacturer’s instructions and cautionary
markings.

1
IMPORTANT SAFETY INSTRUCTIONS
SAFETY PRECAUTIONS FOR WORKING IN THE VICINITY OF A BATTERY
1) Batteries generate explosive gases during normal operation. Use in
well-ventilated area.
2) Consider having someone close enough or within the range of your
voice to come to your aid when you work near a battery.
3) Do NOT smoke, strike a match, or cause a spark in vicinity of battery
or engine. Avoid explosive gas, flames and sparks.
4) Remove all personal jewelry, such as rings, bracelets, necklaces, and
watches while working with a vehicle battery. These items may produce
a short-circuit that could cause severe burns.
5) Be extra cautious to reduce risk of dropping a metal tool onto the
battery. It might spark or short-circuit a battery or other electrical
hardware which may cause an explosion or fire.
6) Wear complete eye protection, hand and clothing protection. Avoid
touching eyes while working near a battery.
7) Study all battery manufacturer’s specific precautions such as
removing or not removing cell caps while charging and recommended
rates of charge.
8) Clean battery terminals before connected with the charger. Be careful
to keep corrosion from coming in contact with eyes.
9) When it is necessary to remove a battery from vehicle to charge,
always remove grounded terminal from battery first. Make sure all
accessories in the vehicle are off in order to prevent an arc.
10) It is NOT intended to supply power to an extra-low-voltage electrical
system or to charge dry-cell batteries. Charging dry-cell batteries may
burst and cause injury to persons and property.
11) NEVER charge a frozen, damaged, leaking or non-rechargeable
battery.
12) If battery electrolyte contacts skin or clothing, wash immediately
with soap and water. If electrolyte enters eye, immediately flood eye
with running clean cold water for at least 15 minutes and get medical
attention immediately.

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SAFETY PRECAUTIONS FOR USING THE CHARGER
1) Do NOT place the charger in the engine compartment or near moving
parts or near the battery; place as far away from them as DC cable
permits. NEVER place a charger directly above a battery being charged;
gases or fluids from battery will corrode and damage charger.
2) Do NOT cover the charger while charging.
3) Do NOT expose to rain or wet conditions.
4) Connect and disconnect DC output only after setting AC cord from
electric outlet.
5) Use of an attachment not recommended or sold by the manufacturer
may result in a risk of fire, electric shock or injury to persons.
6) Do not overcharge batteries by selecting the wrong charge mode.
7) To reduce the risk of damage to electric plug and cord, pull by the
plug rather than the cord when disconnecting charger.
8) To reduce risk of electric shock, unplug charger from outlet before
attempting any maintenance or cleaning.
9) Operate with caution if the charger has received direct hit of force or
been dropped. Have it checked and repaired if damaged.
10) Any repair must be carried out by the manufacturer or an authorized
repair agent in order to avoid danger.
ABOUT CT-3800
1) The CT-3800 is designed for charging all types of 12V lead-acid,6V
lead-acid and 12V lithium-ion batteries, including WET (Flooded), GEL,
MF (Maintenance-Free), EFB (Enhanced Flooded Battery), AGM
(Absorbed Glass Mat), and LIB (Lithium Ion) batteries.
2) Built-in intelligent microprocessor makes charging faster, easier and
safer.
3) This charger has safety features, including spark proof, protection for
reverse polarity, short circuit, overcurrent, overcharge and overheat.
4) It has auto-memory, which returns to last selected mode when
restarted (except Standby Mode).
5) When battery level indicator turns to 100% solid Green LED, it will
automatically switches from full charge to maintenance status to

3
maintain batteries during prolonged periods of storage without
overcharging or damaging the battery.
6) The CT-3800 has four external holes for mounting. Mount the charger
in a desired location with equipped self-drill screws. It is important to
keep in mind the distance to the battery.
7) Following is the charger’s technical specification:
AC Input
220VAC,50- 60Hz, 0.8A
DC Output
6VDC, 3.5A;
12VDC, 3.5A;
12VDC, 1A;
Temperature Controlled
Charger Type
8 steps, Full-automatic Charging Cycle
Start Voltage
> 1V
Housing Protection
IP54
Battery Type
All Types of 6V & 12V Lead-acid
Batteries, and 12V Lithium Ion Batteries
Battery Capacity
2-120Ah (6V), 2-120Ah (12V), Maintains
All Battery Sizes
Accessories Included
Clamp Connectors, Ring Connectors
Ambient Temperature
0℃~ +40℃
CONNECTING TO THE BATTERY
1) Identify polarity of battery posts. The positive battery terminal is
typically marked by these letters or symbol (POS,P,+). The negative
battery terminal is typically marked by these letters or symbol (NEG,N,-).
2) Do not make any connections to the carburetor, fuel lines, or thin
metal parts.
3) Identify if you have a negative or positive grounded vehicle. This can
be done by identifying which battery post (NEG or POS) is connected to
the chassis.
4) For a negative grounded vehicle (most common): connect the RED
POSITIVE clamp / ring connector first to the positive battery terminal,
then connect the BLACK NEGATIV clamp / ring connector to the negative
battery terminal or vehicle chassis.

4
5) For a positive grounded vehicle (very uncommon): connect the BLACK
NEGATIV clamp / ring connector first to the negative battery terminal,
then connect the RED POSITIVE clamp / ring connector to the positive
battery terminal or vehicle chassis.
6) When disconnecting, disconnect in the reverse sequence, removing
the negative first (or positive first for positive ground systems).
7) Follow these steps when using 12V accessory plug: keep the vehicle
hood open. Connect the end of the 12V accessory plug to the charger;
insert the 12V accessory plug into the vehicle’s 12V outlet. If the
vehicle’s ignition key has to be on in order for the 12V outlet to supply /
receive power, turn the key, without starting the engine.
8) A marine (boat) battery must be removed and charged on shore. To
charge it on board requires equipment specially designed for marine
use.
CHARGING MODES
CT-3800 has eight modes: 12V NORM, 12V COLD/AGM, 12V SMALL
NORM, 12V SMALL COLD/AGM, 6V NORM, 12V LITHIUM and 12V REPAIR.
Some charge modes must be held for three (3) seconds or / and pressed
to enter the mode. Do not operate the charger until you confirm the
appropriate charge mode for your battery.
Mode
Battery
Size (Ah)
Explanation
Standby
–––
Not charging or providing any power
(Green LED)
12V NORM
2-120
Charging 12V WET/GEL/MF/EFB batteries
(Green LED)
12V
COLD/AGM
2-120
Charging 12V batteries below 10℃(50℉)
or 12V AGM battery (Green LED)
12V SMALL
NORM
2-40
Charging 12V WET/GEL/MF/EFB batteries
of small battery size (Green LED)
12V SMALL
COLD/AGM
2-40
Charging 12V batteries below 10℃(50℉)
or 12V AGM battery of small battery size
(Green LED)

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6V NORM
(Hold Mode
button for 3
seconds to
enter)
2-120
Charging 6V WET/GEL/MF/EFB batteries
(Blue LED)
12V LITHIUM
(Hold & Press)
2-120
Charging 12V lithium-ion batteries only,
including LiFePO4 (White LED)
12V REPAIR
(Hold & Press)
2-120
An advanced battery recovery mode for
repairing old, idle, stratified or sulfated
batteries. REPAIR Yellow LED + Green LED
(12V)
These “Hold or / and Press”modes are advanced charging modes that
require your full attention before selecting.
Using 6V NORM (Hold)
This mode is designed for 6V lead-acid batteries only. Consult the
battery manufacturer before using this mode.
Using 12V LITHIUM (Hold & Press)
This mode is designed for 12V lithium-ion batteries only, including
LiFePO4. Some lithium-ion batteries may be unstable and unsuitable for
charging. Consult the lithium battery manufacturer before charging and
ask for recommended charging voltage and current.
Using 12V REPAIR (Hold & Press)
This mode is for LEAD-ACID batteries only. It is an advanced battery
recovery mode for repairing old, idle, stratified or sulfated batteries.
NOT all batteries can be recovered. For optimal results, take the battery
through a full charge cycle, bringing the battery to full charge, before
using this mode. When this mode is chosen, do remember press Mode
button for choosing appropriate 12V Mode(s). One REPAIR cycle can take
up to eight (8) hours to complete the recovery process and will enter to
charge (8 steps charging cycle) when completed. This mode uses a high
charging voltage and may cause some water loss in WET cell batteries.
Plus, some batteries and electronics may be sensitive to high charging
voltages. To minimize risks, disconnect the battery from the vehicle
before using this mode.

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CHARGING STEPS
STEP 1: DIAGNOSIS (Check if battery has connected with the charger
and also check battery voltage)
STEP 2: DESULPHATION (If battery voltage is too low, programs
automatically generate pulsing current to remove sulphate, up to 5
hours)
STEP 3: ANALYSE (Check if the battery voltage reaches to the threshold
after desulphation, and charging begins if the battery voltage is OK)
STEP 4: SOFT START (Charge with echelon constant current)
STEP 5: BULK (Charge with constant maximum current until battery
voltage is reached to the threshold)
STEP 6: ABSORPTION (Provide gradually declining current charge for
maximum battery voltage)
STEP 7: ANALYSE (Test if the battery can hold charge)
STEP 8: MAINTENANCE (Continuously monitor the battery, and charging
current will intelligently adapt to the variable battery voltage)

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BATTERY LEVEL INDICATOR
LED
Explanation
25%
The 25% Charge Red LED will slowly flash when the
battery level is less than 25%. When 25% is reached,
the LED will be solid.
50%
The 50% Charge Red LED will slowly flash when the
battery level is less than 50%. When 50% is reached,
the LED will be solid.
75%
The 75% Charge Red LED will slowly flash when the
battery level is less than 75%. When 75% is reached,
the LED will be solid.
100%
The 100% Charge Green LED will slowly flash when
the battery level is less than 100%. When 100% is
reached, the 100% Charge LED will be solid. The
25%, 50% and 75% Charge LEDs will turn off.
LED COMMUNICATION OF ABNORMAL RESULTS
No
.
LIGHT(S)
CONDITION
CAUSE(S)
SOLUTION(S)
1
Solid Red Warning!
LED
Reverse Polarity
Exchange the red and
black clamps or ring
terminals to the
correct battery posts
2
Flashing Red
Warning! LED
Corresponding
charging mode LED
1) Open-circuit
2) Dirty Battery
Posts
3) Dead Battery
1) Connect the red
and black clamps or
ring terminals to the
battery posts
2) Clean the battery
posts
3) Replace the
battery with a new

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one immediately
3
Slow flashing Red
Warning! LED
+
Corresponding
charging mode LED
Charging in 6V
Mode(s) for 12V
battery
Please do manually
press Mode button to
choose correct
charge mode.
CAUTION: If you
choose 12V Mode(s)
for 6V battery, the 6V
battery will be
damaged!
4
Only charging
mode LED is on,
warning and four
battery level
indicator LEDs are
flashing
Overheat protection
Current reduces
when temperature in
charger is too high.
After cooling down,
charge will begin
5
Solid yellow REPAIR
LED
+
12V corresponding
charging mode LED
In 12V REPAIR mode
------
7
Quick flashing Red
Warning! LED
+
Corresponding
charging mode LED
Battery cannot store
electric charge
during charging
process
Replace the battery
with a new one
immediately
8
Only corresponding
charging mode LED
+
Four battery level
indicator LEDs are
all OFF
In Desulphation
Process
------
9
Red Warning! LED
light flashes 2x stop
Battery cannot be
recovered through
1) Replace with a new
battery

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for 3secs, 2x stop
for 3 secs…
Desulphation
Process or Battery
cannot be recovered
through Repair
Mode
2) If battery cannot
be recovered through
Desulphation
Process, try REPAIR
Mode for recovery
10
Flashing Yellow
Warning! LED
Heavily Corroded
Battery (voltage is
less than 3V), need
Repair Mode
Replace with a new
battery or try REPAIR
Mode for recovery
NOTICE: following situation indicates that battery need to be replaced,
although there is no abnormal result LED communication.
After full charging cycle and with 100% of battery level indicator, use this
battery to start matched vehicle’s engine. If engine cannot be activated
(exclude the problem of vehicle itself), it indicates this battery has
declined storage capacity and need to be replaced or try REPAIR Mode
for recovery.
Nameplate icon description
:Class II
:For indoor use only
:Before charging, read the instructions
:Fuse
:Correct Disposal of this product

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This marking indicates that this battery charger and batterypack should
not be disposed with other household wastes throughout the EU. To
prevent possible harm to the environment or human health from
uncontrolled waste disposal, recycle it responsibly to promote the
sustainable reuse of material resources. To return your used device,
please use the return and collection systems or contact the retailer
where the product was purchased. They can take this product for
environmental safe recycling.
WARRANTY
1) This product is warranted to the original purchaser for a period of two
(2) years from the original shipping date, to be free of defects in material
and workmanship.
2) Warranty Performance: During the above two (2) years warranty
period, a product with a defect will be replaced with a new one when
the product is returned to the manufacturer. The replacement product
will be in warranty for the balance of the original two (2) years warranty
period.
3) This warranty is void if the product has been damaged by accident, in
shipment, unreasonable use, misuse, neglect, improper service,
commercial use, repairs by unauthorized personnel or other causes not
arising out of defects in materials or workmanship.
Important safety instructions
1)This appliance is not intended for use by persons (including children)
with reduced physical, sensory or mental capabilities, or lack of
experience and knowledge, unless they have been given supervision or
instruction concerning use of the appliance by a person responsible for
their safety.
2)Children should be supervised to ensure that they do not play with the
appliance.
3)If the supply cord is damaged, it must be replaced by the manufacturer,
its service agent or similarly qualified persons in order to avoid a hazard.
3)The battery terminal not connected to the chassis has to be connected
first. The other connection is to be made to the chassis, remote from the

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battery and fuel line. The battery charger is then to be connected to the
supply mains;After charging, disconnect the battery charger from the
supply mains. Then remove the chassis connection and then the battery
connection.
4)Do not recharging non-rechargeable batteries.
5)During charging, the battery must be placed in a well ventilated area.