Electrical parameters
1. Voltage range
Applicable battery pack: 3S (ternary lithium 12.6V) to 8S (FeLi
33.6V)
Overcharge protection threshold: single cell 4.25V±0.05V (ternary
lithium) / 3.65V±0.05V (FeLi)
Overdischarge protection threshold: single cell 2.45V±0.1V (ternary
lithium) / 2.0V±0.1V (FeLi)
2. Current performance
Continuous discharge current: 120A (stable operation)
Peak current: 300A (supports 5-second pulse discharge)
Short-circuit protection response time: ≤10ms (self-recovery
requires charging trigger)
3. Temperature monitoring
Built-in NTC sensor, monitoring range: -20℃~85℃ (accuracy ±1℃)
High temperature protection threshold: 70℃±5℃ (programmable
adjustment)
Protection mechanism
1. Basic protection functions
Overcharge/over-discharge protection, overcurrent protection, short
circuit protection, temperature protection
Balance function: passive balance, balance current 80mA-150mA
(voltage difference repair)
2. Extended protection
Support lead-acid battery modification to lithium battery system
(voltage parameters need to be matched)
Bluetooth communication module (customizable): real-time view of
voltage, temperature, and current data
Structural design
1. Hardware configuration
Shell material: all-aluminum alloy die-casting process, surface
anodizing treatment (anti-corrosion)
Heat dissipation solution: internal thermal conductive silicone +
external heat sink (support natural convection/air cooling)
2. Physical specifications
Dimensions: 95×68×15mm (compact package)
Weight: ≤2000g (including shell and heat dissipation components)
Compatibility and application
1. Applicable battery types
Ternary lithium battery (3.6-4.2V/cell), lithium iron phosphate
battery (3.2V/cell), lithium titanate battery (2.3V/cell), sodium
ion battery (2.3V/cell)
2. Typical scenarios
Industrial equipment: AGV robots, electric forklift battery packs
Energy storage systems: outdoor power supplies, solar energy
storage equipment
Vehicle modification: lead-acid batteries replaced with lithium
battery packs (such as electric vehicles, RVs)
Certification and warranty
• Certification standards: RoHS, CE (in compliance with export
requirements)
• Warranty period: 18 months (non-human damage)
Packing list
• Protection board body × 1
• Cable × 1
Technical Parameters
| | Item type | Parameters |
| 1 | Parameter Overview | Product Model | EK-BM3R8S120A |
| Product Size(mm) | L95*W68*T15 |
| Product Weight(kg) | 0.25 |
| Product Material | FR-4 / Lead-free spray tin |
| Applicable battery type | Lifepo4 | Li-ion | Lto | SIB |
| Applicable battery string | 3S-8S | 3S-8S | 3S-8S | 3S-8S |
| Rated discharge current | 120A | 120A | 120A | 120A |
| Peak starting current | 300A | 300A | 300A | 300A |
| | Item type | Trigger
(time) | Trigger
(time) | Trigger
(time) | Trigger
(time) | Trigger
(time) | Trigger
(time) | Trigger
(time) | Trigger
(time) |
| 2 | Charging protection | Overvoltage protection voltage value | 3.65V/1S | 3.50V/1S | 4.25V/1S | 4.05V/1S | 2.85V/1S | 2.75V/1S | 3.95V/1S | 3.80V/1S |
| Balanced phase difference voltage value | Trigger voltage difference 30mV / trigger time 0.5S / balance time
10S cycle |
| Balanced voltage value | 3.45V | 3.70V | 2.50V | 3.10V |
| Overcurrent value | 120A/2S, disconnect charger to recover |
| Low temperature value | Charge over-temperature protection 60℃/2S / Release 55℃/2S |
| Overtemperature value | Charging low temperature protection -5℃/2S / Release 0℃/2S |
| 3 | Discharge protection | Undervoltage protection voltage value | 2.30V/1S | 2.70V/1S | 2.75V/1S | 3.0V/1S | 1.70V/1S | 1.80V/1S | 1.50V/1S | 2.00V/1S |
| ①Overcurrent protection value | 150A/2S, disconnect load or activate charging |
| ②Overcurrent protection value | 250A/0.5S, disconnect load or activate charging |
| Short circuit protection value | 500A/128uS, disconnect load or charge activated |
| Low temperature value | Discharge over-temperature protection 65℃/2S, release 60℃/2S |
| Overtemperature value | Discharge low temperature protection -20℃/2S, release -10℃/2S |
| 4 | Others | Standby current consumption | 25uA |
| Motherboard lock voltage | / |
Size $ Packing List
Package included:
1 * BMS with heatsink
1 * NTC Terminal Cable
1 * Switch Cable
1 * Terminal Cable
6 * Terminal Lugs
6 * M5 Screws
Wire Diagram
Wiring precautions:
1. Installing the protective board requires a certain amount of
technical electronic knowledge.
2. When wiring, first connect the B- wire at the soldering pad
position to the total negative terminal of the battery (the B- wire
should be soldered to a short and thick wire) and solder the wired
terminal to the battery pack first, and then insert the protective
plate.
3. The connection between the battery terminal B- and the
protection board terminal B- should be short and thick, otherwise
it will cause the protection board to charge and discharge in
advance and malfunction.
4. You need to use thick wires when wiring P+/P-. Wires that are
too thin and too long will burn the board!
FAQ
Q1. Why did we choose you?
* We can provide you with efficient after-sales service, with more
than 10 years of strong technical support.
* Products have passed FCC, CE, ROHS and other international
standards certification.
* We can provide you with factory price, Welcome you to visit our
factory and production process.
Q2. What is your product range (type)?
*We mainly do battery management systems in the fields of power
batteries, energy storage batteries and consumer batteries.
*Mainly used for LFP, Li-ino and LTO batteries.
Q3: How do I know which kind of material & type my battery is ?
*Please look the battery body, If the normal voltage of your
battery shows 3.2V, The battery is LiFePo4.
*If the normal voltage of your battery shows 3.6V or 3.7V, the
battery is Li-ion or Lto battery.
Q4. Do you have minimum order requirements?
Can it be customized? What is the lead time for samples and
batches?
*Our minimum order quantity is 1 piece, ODM customization is
available.
* 1~3 days delivery of existing samples, 3~10 days delivery of
customized samples.
Q5: What if i can't use it?
*Regular products have instructional videos, We can also support
online video call guidance from engineers.
Q6. What are your terms of payment?
*We accept wire transfer and cash payment, all negotiable. Payment
method :visa, mastercard, T/T, PayPal, APPLE_PAY, GOOGLE_PAY,
GC_REAL_TIME_BANK_TRANSFER, RMB
Q7. How do you guarantee the quality?
* All our products are subjected to professional laboratory 100%
testing, as well as repeated aging tests.
* Obtained FCC, CE, ROHS and other international standard
certification.
* Provide 3 years after-sales warranty service. Free spare units
for replace in 3 years.
Q8. How to choose a BMS suitable for our battery?
*Depending on the voltage and current that matches your battery,
you can consult our customer service and we will provide it for you
equipped with the most suitable battery management system.
Q9. How can i contact you?
*We have 7x24 hours online service, Please leave us a message
online.
*You can also contact us by Email, WhatsApp, WeChat, etc(see
below). We are so glad to work with you.
Noted: We are source manufacturer, We have own brand for "EnerKey",We can customized product as your requirement(Voltage, Wire,Etc) .
We can provide you competitive price in the market if you have bulk
order, Please don't hesitate to contact us.
Mobile & WhatsApp & Wechat: +86 15387469240; Email: kiwi@enerkey.cn
