About Payment 
 Shipping & Cost
 Battery SDS
 Battery Terminology
 Battery Knowledge
Privacy Policy
 Export restrictions


Shopper Award
Security Verified Seal

PCM with Equilibrium &Temperature protection function for 14.8V Li-Ion / 12.8V LFP Battery Pack @ 30A limit (#6221)

4 pins connector
Your Price: $50.00

Product Options


Protection Circuit Module for 4 Cells Li-Ion / LiFePO4 Battery Pack

This protection circuit is specially designed for 14.8V Li-Ion / 12.8V LiFePO4 Battery pack with 30A discharging rate. Different than normal PCB, it provides equilibrium function after battery pack is fully charged. PCM will detect each cell's voltage and trim higher voltage down until other cells reach the same voltage level. Therefore, it helps Li-Ion cells have longer service life. Also the PCM will provide the following protections:


Test item


1 Voltage Charging voltage


Balance voltage for single cell Li-ion:4.20 V±0.03V,
2 Current Balance current for single cell 0-130mA         
Current consumption for single cell ≤20μA
Maximal continuous charging and discharging current 30A
3 Over-charge Protection Over charge detection voltage 4.25V +/- 0.025V (Li-Ion)
3.9V +/- 0.025V (LFP)
Over charge detection delay time 0.5-1.5S
Over charge release voltage 4.05V +/- 0.025V (Li-Ion)
3.8V +/-0.025V (LFP)
4 Over-discharge Protection Over discharge detection voltage 2.5V +/- 0.07V (Li-Ion)
2.0V +/-0.05V (LFP)
Over discharge detection delay time 100-200mS
Over discharge release voltage 3.0V +/-0.1V (Li-Ion)
2.3V +/-0.05V (LFP)
5 Over-Current Protection Over current detection voltage 0.6V +/- 0.1V
Over current detection current 90-110A
Detection delay time 5-15ms
Release condition Cut load
6 Short Protection Detection condition Exterior short circuit
Detection delay time 100-500us
Release condition Cut load
7 Resistance Protection circuitry(B+ to P+) ≤30mΩ
8 Temperature Operating temperature range -40-+85℃
Storage temperature range -40-+125℃
9 Temperature Protection


10 Size

11 Specification

12.8V (4S)
14.8V (4S)


  • If you want to use this pcm for a battery that is rated less than the Maximum Discharge drain, you must add additional protection device to protect the battery itself. Such as: proper rated polyswitch.  
  • To achieve balance, each cell in battery pack must has equal voltage within tolerance of 0.02-0.03V. When charger LED turn Green, allow 30 minutes for pack to balance before use
  • You must be professional in Li-Ion battery pack to buy the PCM. Misusing PCM may cause battery damage or explode.  We are not responsible for any damage caused by user.

Related Products

Product Reviews

(0 Ratings, 0 Reviews)
What to consider when designing Lithium Batteries?
Bluetooth Technology for Lithium-ion/LiFePO4 Batteries
UN 38.3 Safety Test

We own a national standard UN38.3 testing lab. We can provide UN38.3 test service to our customer.

If you want to set up your own lab, we also provide UN38.3 & IEC62133 equipments and onsite training. Email us for the quote and lead time.
Lithium Battery Shipping Regulation
Recommendations on How to get ≤30% Rated Capacity for Shipping
Thermal Abuse Test for IEC62133
Mailing Lists