6S 40A 18650 Lithium Battery Protection Board


In stock

SKU: 618355
  1. Maximum discharge current: 40A
  2. Instantaneous discharge current: 70A
  3. Charging voltage: 25.5V
  4. Maximum charging current: 40A
  5. Overcharge detection voltage: 4.25±0.025V
  6. Overcharge protection delay: 1.0±0.5S
  7. Overcharge release voltage: 4.15±0.05V
  8. Battery balance detection voltage: 4.125±0.025V
  9. Battery balance release voltage: 4.125±0.05V
  10. Battery balance current: 41±5mA
  11. Working current: ≤40uA


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Brand: Generic
Category: Battery Protection Board, Batteries and Accessories on Sale
Tags: 6S 40A BMS

BMS (Battery Management System) – a battery management system that is designed to monitor the status of batteries, control the process of charging/discharging the battery, etc.

Six batteries (18650) can be connected simultaneously to this charge-discharge controller module. The module has protection against short circuit, overcharge and over-discharge. One of the functions of the charge controller is to turn off the power supply for the batteries when the maximum capacity of at least one battery is reached. This BMS controller is designed for more than 30,000 hours of operation. The maximum allowable current is 40 A.

If the maximum permissible value of the supply voltage is exceeded, the charge controller activates the “protection” mode. In order to restore the module, it is necessary to re-apply voltage to the input of the BMS board or wait a while until the charge controller automatically disables protection.


  1. Small size designed for a four-cell battery pack.
  2. Simple and  convenient circuit for easy connections
  3. Over-charge/Over-discharge Protection.

Package Includes:

1 x 6S 40A 18650 Lithium Battery Protection Board

Working current


Maximum Discharge Current


Instantaneous Discharge Current


Charging voltage


Maximum charging current


Temperature range


Overcharge detection voltage


Overcharge release voltage


Battery Balance Detection Voltage:


Overdischarge detection voltage

2.7 ± 0.1V

Overdischarge Detection Delay


Overdischarge release voltage


Overcurrent detection voltage


Overcurrent Detection Delay


Overcurrent protection current


Weight (g):


Length (mm):


Width (mm):


Height (mm):


Shipping Weight 0.02 kg
Shipping Dimensions 8 × 3 × 1 cm
15 Days Warranty

This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defects.  Reimbursement or replacement will be done against manufacturing defects.

What voids warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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6S 40A 18650 Lithium Battery Protection Board

What is Battery Management System? – BMS Building Blocks, Working & Functions

A Battery Management System AKA BMS ensures the safety of the battery pack by continuously monitoring and regulating parameters like temperature & voltage.

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Country Of Origin: China