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Protection Circuit Module (PCB) for 14.8V Li-Ion Battery Pack (4A limit) with Fuel Gauge Socket (#2778)

Your Price: $6.75
In Stock

Product ID # 2778
Part Number:

Quantity Discounts

5 to 20$6.54
21 to 50$6.41
51 to 100$6.27
101 or more$6.07
 Protection Circuit Board Specifications  For 4S 14.4V/14.8V Li-ion/Li-po Battery  Pack 
Model: PCB-S4A5-GS
No. Test   item Criterion
1 Voltage Charging voltage DC: 16.8V CC/CV (4.2V/cell)
Balance voltage for single cell N/A
2 Current Balance current for single cell N/A
Current consumption for single cell ≤50μA
Maximal continuous Charging current 4A
Maximal continuous discharging current 4A
3 Over charge Protection
(single cell)
Over charge detection voltage 4.325±0.025V
Over charge detection delay time 0.3S-2S
Over charge release voltage 4.150±0.050V
4 Over discharge protection
(single cell)
Over discharge detection voltage 2.40±0.080V
Over discharge detection delay time 500-1500mS
Over discharge release voltage 3.00±0.100V
5 Over current protection Over current detection voltage 0.15V±0.025V
Over current detection current (For discharge only) 5±1A
Detection delay time   50ms-150ms
Release condition Cut load
6 Short protection Detection condition Exterior short circuit
Detection delay time 200-800us
Release condition Cut load
7 Resistance Protection  circuitry (B- TO P-) ≤60mΩ
8 Temperature Operating Temperature Range -40 to +85℃
Storage Temperature Range -40 to +125℃
9 Weight   0.6 Oz (17.0 grams)
10 Dimenstion LxWxT 50 x 16 x 3.5-4.0 mm
11 Specification in pdf file Download the specification  

 For other PCM/PCB, please check our PCM/PCB/BMS/CMB/UPS category


  • If you want to use this protection circuit board for a battery that is less than the rated drain, you must add additional protection device to protect the battery itself. Such as: proper rated polyswitch. 
  • You must be professional in Lithium battery pack to buy the protection circuit board. Misusing may cause battery damage or explode. We are not responsible for any damage caused by user.

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Product Reviews

(1 Rating, 1 Review) Average Rating:
Works after power applied, could use some more instruction
Jarred Braun (Bloomington, IN) 9/19/2014 6:02 AM
This is my first attempt at making a battery pack. I was interested in creating a power supply that could operate a computer between 12v-19v. Soldering was super easy and the fuel gauge is a nice option. I used 3400mAh 18650's (from BatterySpace) combined with plastic battery holders and some 18awg wire. The unit didn't work until I connected it to a power source, which I've read elsewhere on the site so I was prepared for that. I used the completed pack on a PICO-UPS (similar to the 12VDC Micro UPS) as the battery input and connected the constant DC to the primary which powered the unit. Unfortunately I need to do some more testing, especially with the charging aspect of the board. Voltage outputs when read with the voltmeter registered at ~18v, so I inadvertently pre-overcharged the batteries somehow, and the UPS refuses charge the pack as is, but it will register it as active and available for power draw. I'm sure the board operates as intended, but I do have some lingering concern with wiring (feedback appreciated.) This is my first build. The instructions show 'approximately' how the cells should be connected to the board in series. Since I'm using a battery holder, I series the holders together +/- and then soldered individual leads from the +/- spots on the holder to the points on the board. If I'm reading the instructions correctly, possibly the wires should come together on the board, and not on the pack. My fear is in my configuration there is no protection and the circuit will always be complete in the event of a failure, or worse, no overcharge protection for the cells.
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