Green BM200 Series User manual

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BM200-**
Battery Tester-Charger-Discharge-Maintainer
User Manual
REV2.0
Revision Date：Feb 2023

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BM200-xx is an intelligent instrument that integrates the four functions of battery testing(analyzing),
charging, discharging and maintenance.
It is designed with a portable aluminum alloy shell, color TFT display.
BM200 is widely used for performance testing and routine maintenance of most power batteries
and energy storage batteries.
BM200-05 is for 2V~4V 10Ah~400Ah Li-ion /LiFePO4 /Pb-Acid /NiMH
BM200-32 is for 2V~28V 2Ah~80Ah Li-ion /LiFePO4 /Pb-Acid /NiMH
The four main functions are
1. Charging: can set constant current & constant voltage for charging process.
2. Discharge: can set constant current value & cut-off voltage for discharging.
3. Test/analyze: can measure battery voltage, internal resistance, SOC, SOH,
true effective capacity Ah value and charge/discharge curves.
4. Maintenance: for the battery that has been left standing or in standby for
more than 6 months, do a auto maintenance process to keep
or recover battery good active capacity and health life.
Input of BM200 is AC100~240V, universal global voltage range. The adjustable range of output
constant current charging current is 2A~30A (for -05) or 1A~6A (for -32); The charging limit voltage
and the discharge cut-off voltage can also be adjusted manually. It has a variety of abnormal
safety protection measures such as battery reverse connection, wrong connection, short circuit,
overvoltage, undervoltage, over-current and over-current heat.
BM200-xx-B/D has Bluetooth function, through which users can view the historical charging and
discharging data and curves with their phones or PC.
BM200-xx-C/D has RS485 communication interface, which can realize the cascade function.
Multiple BM200 cascades can simultaneously test and maintain up to 255 series of multi
connected high-voltage battery packs.
Features

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View of product
AC Input port
LCD Displayer
Battery input
RS485 port
Buttons：
Enter: functions/confirm
Up: increase/page up
Down: decrease/page down
Soft On/Off
Important information
1.Make sure the battery voltage
is less 30V
2.For precise test results please
Input correct battery data
3.For safety and correct operate
please read user manual 1st
Battery 4-IN-1 Instrument
Tester/Charger/Discharge/Tender
Green Digital Power Tech Co Ltd

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1. Connect battery: Please make sure the voltage of the battery un does not exceed 30V,
find red and black alligator clip cable, insert it’s yellow plug to BM200,
let red clip connect to positive pole of battery, and black clip connect
to negative pole.
If the battery is connected correctly and there is still electricity in the
battery, the LCD screen of BM200 will be following displayed
2. Connect AC power:If you only want to test battery parameters quickly, you can skip
to step 3 directly, without connecting to AC power.
To charge, discharge and maintain battery, or accurately
measure the battery capacity Ah value and healthy SOH value,
please insert mains power (AC100V~240V), if AC power is
connected, LCD displays the following information:
How to use
BM200 Battery 4-in-1
AC: NG Battery: Ok
1. Set battery param
2. Run last param
3. Set system param
BM200 Battery 4-in-1
AC: OK Battery: Ok
1. Set battery param
2. Run last param
3. Set system param

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Note: Following examples are all based on BM200-05 @ 3.2V100Ah LiFePO4 battery.
3.Set Battery Parameter：BM200 can be used for many types batteries. To get the accuracy test
results and charge safety, at first you should set the connected battery
parameters. If the battery connected is the same as last time, please
refer to Clause 3.2; Otherwise, please execute the following
3.1 select [1. Set battery param] (When the background of this item is highlighted, it means
selected, the same below), press <Enter> Key，screen will be:
[Battery type]: Select of one from LiFePO4, Li-Ion, Pb-Acid, NIMH, NICD,
[Battery voltage]: Select battery nominal voltage from 2.0V ~ 28.8V, marked on battery label.
[Battery capacity]: Input the Ah value of battery capacity, which is marked on battery label.
[Charge voltage]: Charge voltage limit during charging process, marked on battery label.
This step can be skipped, BM200 will auto set a good default data.
[Charge current]: Set a constant current for charging process, recommend is 0.1C~0.5C.
This step can be skipped, BM200 will auto set a good default data.
[Battery in-resist]: Set the battery internal resistance, which is listed on battery datasheet.
This data is only used for evaluate battery SOH. If you have no data,
this step can be skipped, BM200 will auto set a genaral default data.
[Dischar current]: Set a constant current for discharge process, recommend is 0.1C~0.5C.
This step can be skipped, BM200 will auto set a good default data.
[Dischar cut-off]: Set cut-off voltage for discharge process. Recommend is 0.8*rating voltage.
This step can be skipped, BM200 will auto set a good default data.
Battery type : LiFePO4
Battery voltage : 3.2 V
Battery capacity : 100 Ah
Charge voltage : 3.65 V
Charge current : 20.0 A
Battery in-resist : 5 mΩ
Dischar current : 20.0 A
Dischar cut-off : 2.60 V
Save Return

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Note: [Battery type], [Battery voltage], and [Battery capacity] is necessary for
setting process, the rest 5 items can be skipped if you have no special request.
Press <Up> or <Down> keys to highlight the items, press <Enter> key to
Confirm selection, then press <Up> or <Down> change data, press<Enter>
when the data is correct as you wanted. After that, press <Save>. Then
screen will enter 3.3 step.
3.2 Select [2. Run last param], if the battery data is same as last time for BM200.
Press <Up> or <Down> keys to highlight the items, press <Enter> key to
Confirm selection, Then screen will enter 3.3 step.
3.3 After done 3.1 or 3.2 step, screen will be following:
If the parameters are correct, users can select the four listed in the menu according to
their task requirement functions. Use <Up>, <Down> and <Enter> to select and run.
If errors are found in the preview parameters, please press <Enter> for more than 2
seconds, and the system will return to the home page to reset battery parameters.
4. Main functions
4.1 [Test]: Measure battery voltage, internal-resistance, SOC and SOH within 5 seconds
SOC, means State-of-charge of battery, range is 0 ~ 100%.
SOH, means State-of-health of battery, range0~100%.
Setting Preview
Battery ：3.2V 100Ah LiFePO4
Charge ：3.65V 20.0A
Discharge ：2.6V 20.0A
Test Charge Discharg Maint

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Run [Test] function, after 5 seconds, screen will display test results:
The fast tested SOC percentage is built based on the measured battery voltage and
equipment learning. This SOC is calculated by looking up the voltage-SOC table.
This fast tested SOC error may be relatively higher.
The fast tested SOH, battery health status, is also based on the tested internal
resistance of battery. This SOH is calculated by looking up the resistance-SOH table.
This fast tested SOC error also may be relatively higher.
To obtain accurate SOC and SOH, please select [Maintenance] function and run a cycle.
4.2 [Charge]: According to the selected battery type and charging parameters, the
system automatically calls the best charging process curve. When charging,
the LCD displays the following information:
Battery voltage
Battery voltage
3.2V 100Ah LiFePO4
Test mode
SOC. : 11%
SOH. : Good
RES. : 5.2mΩ
Time run ：----
Charged ：----
3.2V 100Ah LiFePO4
SOC. : 91%
SOH. : Good
RES. : 5.2mΩ
Time run ：4h 33m
Charged ：80Ah
Battery current
Charging

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After battery is fully charged, the display screen will two different display contents:
After the battery is fully charged, to view the charging curve of the battery, please press
<Up> Key, screen will display the complete battery charging curve, as follows:
Press <Up> or <Down> key again, you can switch the graph and list pages alternately
4.3 [Discharge]: Automatically discharge according to the selected parameters;
During discharging process, screen will be following view:
3.2V 100Ah LiFePO4
SOC. : 91%
SOH. :
98.7%
RES. :
5.2mΩ
Time run
：
5h 33m
Charged
：
103.6Ah
Full charged
from empty
test Capacity
98.7 Ah
3.2V 100Ah LiFePO4
SOC. : 91%
SOH. :
98.0%
RES. :
5.2mΩ
Time run
：
4h 56m
Charged
：
93.6Ah
Full charged
from no-empt
est. Capacity
98.0 Ah
When you charge battery from empty state, after
full charged, you will get an accurate capacity.
When you charge battery from non-empty state,
after full charged, it can get an estimated capacity
Charge curve
voltage
time
SOC. : 30%
SOH. :
Good
RES. :
5.2mΩ
Time run
：
2h 33m
Discharg
：
70Ah
3.2V 100Ah LiFePO4
Discharging

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After the battery is emptied, the display screen will There are two different display contents:
After the battery is fully charged, to view the charging curve of the battery, please press
<Up> Key, screen will display the complete battery charging curve, as follows:
Press <Up> or <Down> key again, you can switch the graph and list pages alternately
4.4 [Maint]: Automatic maintenance based on selected battery parameters:
For batteries that have been idle for more than 6 months or have been floating
charged for a long time, it should be regularly (preferably every 6 months or so)
standard charging and discharging maintenance process. The standard
maintenance procedure is to use 0.2C current first fully charge the battery - then
drain the battery with 0.1C current - then use 0.1C charge current to full fill the
battery. After finished this maintenance process, the vitality, the life time and the
effective capacity of battery will be protected and improved to the maximum.
3.2V 100Ah LiFePO4
SOC. : 0%
SOH. :
98.7%
RES. :
5.2mΩ
Time run
：
3h 43m
Discharg ：98.7Ah
Discharged
from full
test Capacity
98.7 Ah
3.2V 100Ah LiFePO4
SOC. : 0%
SOH. :
97.7%
RES. :
5.2mΩ
Time run
：
3h 43m
Discharg ：67.6Ah
Discharged
from non-full
est. Capacity
97.7 Ah
When discharge battery from full charged state, after
discharged empty, it will get an accurate capacity.
When discharge battery from non-full state, after
discharged empty, it will get an estimated capacity.
discharge curve
voltage
time

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After starting the automatic maintenance function, the LCD screen displays the
status message of "Maintain **", here ** refers to CH--charging, DS--discharging,
OK-- completion all maintenance jobs.
Examples are as follows:
Generally, a complete maintenance process takes about 30 hours. After the process is
completed, the battery capacity Ah value is the most accurate. Press <Up> key, the
display screen will display the recorded complete battery charging/discharging curves.
Tips: During charging, discharging, maintenance and other processes, the user can press <Enter>
briefly Pause, press again to resume; Long press <Enter> for 2 seconds to terminate the
current process and return to the initial main page
4. Bluetooth function:
BM200 - * * B/D has Bluetooth communication function, through which users can use mobile
phones, PAD or PC checks the historical charging and discharging data and curves of the battery
pack, also remotely sets and controls BM200 working status.
The BM200 series provides Android APP and PC Windows applications software. Please refer to
the appendix "Introduction to the Use of Android App of BM70/200 Battery Tester" document.
Note: Once the BM200 device is successfully connected to the mobile phone, tablet or PC
through Bluetooth, the function keys on the BM200 panel will be temporarily frozen and disabled.
At this time, only the function keys in the mobile phone or PC APP can control the battery
settings and function operation of the BM200. When the APP program is finally closed, the panel
keys of the BM200 can resume their normal functions.
SOC. : 30%
SOH. :
Good
RES. :
5.2mΩ
Time run
：
2h 33m
Discharg
：
70Ah
3.2V 100Ah LiFePO4
Maintain DS

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5. Cascading function:
BM200 - * * C/D has cascading function. Multiple BM200 running at cascading can
simultaneously apply for more than 125 series battery pack connected in series. Which is
high-voltage and large capacity. for inspection and maintenance.
Here show you how to use cascading function:
1) Select a BM200 - * * C/D device with #01 RS485 address can running as a host. Actually
the default RS485 address of all BM200 - * * C/D device are #01.
2) All other BM200 - * * C/D devices participating in the cascade must be designated as
slave mode, and the 485 addresses of the devices must be changed to "# 02", "# 03"
and “#nn”, according to the connection order of the battery pack. The 485 address can
be modified via [3. Set System Param] on the initial page. Press the <Up> key briefly,
and the address will be+1. Press the <Enter> key briefly, and the current modified
address will be confirmed to take effect. Press <Enter> 2 seconds return to main page.
3) Connect each BM200 equipment participating in the cascade with the 485 connection
cable; Each BM200 is connected with its own number of positive and negative battery
poles. The following figure shows an example of 8 BM200-05C/D cascades
4) After cascading, only # 01 host has the power to set battery parameters and control
functions. The control of slave is prohibited. The host will send the same battery setting
parameters to each slave, and start/ stop function operations synchronously. The display
screen of each slave will display the voltage, current, capacity, internal resistance, SOC,
SOH and other information of the corresponding battery unit.
It is recommended that the host use APP (for phone, PAD or PC) to set and control the
operation in the cascading state, because in this way, you can fully understand the
details of each battery cell on the mobile phone or tablet.
BM200-05D #01
BM200-05D #02
BM200-05D #08
0V
Battery
negative
3.6V
6.4V
25.6V
AC power
100~240V
485 cable
Battery cable

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Items \ model
BM200-05 [B, C, D]
BM200-32 [B, C, D]
AC input power
100~240V 50HZ
Suitable battery type
Pb-Acid(AGM, VRLA, Gel), Li-Ion, LiFePO4, NiMH, NiCd
Charging method
PreCharge -- C.C main charge -- special charge CV or CC -- end charge
Suitable battery capacity
10Ah ~ 400Ah
2Ah ~ 80Ah
Suitable battery voltage*1
2.0V ~ 4.0V
2.0V ~ 29.4V
Charge/discharge voltage set
2.0V ~ 5.0V
2.0V ~32.0V
Charge current set
2A ~ 30A
1A ~ 8A (150W Max)
Discharge current set
1A~25A ( 90W Max.)
1A~ 6A (90W Max)
Temperature compensation
Auto compensation charge voltage according to environment temperarure
Voltage test precision
+- 1.0%
Current test precision
+- 2.5%
Capacity test precision
+- 2.5%
Abnormal protection
Shorted, reversed, OVP, OCP, OLP, OTP,
Bluetooth function
-B and -D model have this function
RS485 communication
-C and -D model have this function
Cascade function
Size and weight
240*115*65mm, 1.5kg
Safety standard
CE, EN62368, EN61000
Note 1 *: Multiple modules are used in cascade, which can perform internal resistance and capacity testing,
performance maintenance, and serial equalization for each single battery of multiple series battery packs
Specification

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Be sure to understand theinformation of the battery tobe charged or discharged
accurately. If the parameters is set up incorrectly the battery may severely be
damaged. Especially Lithium battery can cause a fire or an explosion by over-
charging.
If any malfunction is observed immediately terminate the process and refer to
the operation manual.
Keep away the unit from dust, damp, rain, heat direct sunshine and vibration.
DO not drop it.
This device and the battery to charge or discharge should be set up on a head-
resistant, non-inflammable and non-conductive surface. Never place them on a
car seat, carpet or similar. Keep all the inflammable volatile materials well away
from operating area.
The outer case slots and fan serve to cool the device so must not be covered
of enclosed. Provide good ventilation.
Please only use the official cable and clips, which are provided with device
package. Other type cable or clip will affect testing and charging accuracy.
Please clamp battery terminal poles tightly, otherwise the test result will be not
Accuracy.
Please don’t want to charge batteries when:
- The battery voltage exceeds the limit of BM200’s specification.
- Battery pack, which consists of different types ofcell.
- Non-rechargeable batteries (Explosion hazard).
- Faulty or damaged battery.
- Battery fitted with an integral charge circuit or special protection circuit.
- Batteries are electrically linked to user’s loads in device.
Safety notes

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Appendix I: BM** APP for Android
This APP software is designed for BM** family Battery Tester-Charger-Discharger-Tender, as a
convenient user tool. This software is used to pair, connect and communicate through BLE Bluetooth.
Through this function, users can view the historical charging and discharging data and curves of the battery
pack with Android phones, and remotely set and control the working state of the device.
In main page, there are three function buttons: [SEARCH BLE], [SET BATTERY PARAM] and [RUN
LAST PARAM], also, there are three status on the lower of main page: AC power, Battery and BLE 。When
Bluetooth connected successfully, the “BLE” will show “OK”，when AC power and Battery connected correctly,
their status are all show “OK”.
Brief introduction
How to use

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Connect Bluetooth:
Click [SEARCH BLE] button, find your BM** device and select it. Note: Before use, you need to give the
software Bluetooth permission and location permission and open Bluetooth and location, otherwise you will
not be able to search for Bluetooth devices.
Note: Once the BM device is successfully connected to the mobile phone or tablet computer through
Bluetooth, the function keys on the BM panel will be temporarily frozen and disabled. At this
time, only the function keys in the mobile phone or tablet APP can control the battery settings
and function operation of the BM. When the APP program is terminated and closed, the BM
panel keys can resume their normal functions.

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Set battery parameter:
Click [SET BATTERY PARAM] button, enter below page:
Please see page 5 (section 3.1) to learn how to set all these parameters value.
Note: [Battery type], [Battery voltage], and [Battery capacity] is necessary for
setting process, the rest items can be skipped if you have no special request.

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Preview the running parameters:
This interface will display the parameters you have just set. If the preview parameters are found to be
incorrect, click the [RETURN] button to return to the operation parameter setting interface and reset the
parameters.
Below the preview parameters are four function key buttons: [CHARGE], [DISCHARGE], [MAINTAIN]
and [RETURN]. Click the function key to enter the corresponding operation interface.
LiFePO4
12.8 V
20.0 Ah
14.4 V
4.0 A
25 mΩ
2.0 A
10.0 V
60.0 ℃

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Running view:
The upper part of the operation interface will display the battery voltage and capacity values set by the
user. The mode displays different states, and then show the battery voltage, current, capacity, internal
resistance, SOC and SOH. If the equipment works in multi section cascade mode, the "Serial Number" column
will the tested data for each battery.
After charging or discharging done, click the [SHOW CURVE] button to enter the charging and
discharging curve viewing interface. Click [SHOW CURVE] button again, return the earlier main
data view screen.
[ON] button will let user start or stop the charging/discharging/maintaining process.
12.8V 10.0Ah LiFePO4
Charging……
CH Volt Curr Res Capa SOC SOH
V A mΩ Ah % %
01 14.31 4.01 11.2 8.8 92 --
Run Time: 2h 45m