Features:
Protection circuit board is the heart of battery pack, must to have to avoid battery pack from explosion, fire and damage. 
It will protect battery pack from overcharging, over-discharging over-current and short circuit.
The protection board with balance has equilibrium function to keep each cell in balance and good service life.
Choosing the correct protection board and applying it appropriately is vital to the longevity your batteries.
Quiescent current＜ 30uA, so power consumption is small.

Specifications:
Type(Optional): without balance, with balance
Model: HX-3S-FL20(without balance) ,HX-3S-FL25A-A(with balance)
Size:
without balance:58 *20 *3.6mm/2.28*0.79*0.14inch
with balance: 56*45*4.0mm/2.20*1.77*0.16inch  
Over voltage range: 4.25-4.35v±0.05v
Over discharge voltage range: 2.3-3.0v±0.05v
Maximum operating current: 15 A (without balance),0-15A(with balance)/
Maximum transient current: 20A(without balance), 20-25A(with balance)
Quiescent current: ＜ 30uA
Internal resistance: ＜ 100mΩ
Charging voltage: 12.6v - 13V
Working temperature: -40~+50℃
Storage condition: -40~ +80℃
Effective life: >30000h
Short circuit protection: Yes, delayed self recovery
Balance current(with balance): 45mA
The component included:
without balance: 1 pcs 2110-CB protection chip, 2 pcs AOD472
with balance:1 pcs 2110-CB protection chip, 1 pcs BB3A ,4 pcs AOD472/AOD452
Test point instructions(with balance): S1 S2 short circuit P + P - will output voltage, indicating that all MOS protection is normal, adding a constant temperature detection can extend the temperature protection function.

Package Included:
1 x PCB Protection Board(have assembled)

Note:
1.Do not mix the good battery and poor battery to use.
2.The internal resistance of 3 battery capacity are closer  will be better.
3. Please buyers know the professional knowledge of this module before buying.