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comidox 4s 20a 14.8v li-ion lithium 18650 battery bms pcm protection pcb board module with 16.8v overcharge, over discharge, and short circuit protection - pack of 2 logo

Comidox 4S 20A 14.8V Li-ion Lithium 18650 Battery BMS PCM Protection PCB Board Module with 16.8V Overcharge, Over Discharge, and Short Circuit Protection - Pack of 2 Review

4

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Poor

Revainrating 3 out of 5  
Rating 
2.8
🚪 Garage & Shop, 🔧 Automotive Tools & Equipment

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img 1 attached to Comidox 4S 20A 14.8V Li-ion Lithium 18650 Battery BMS PCM Protection PCB Board Module with 16.8V Overcharge, Over Discharge, and Short Circuit Protection - Pack of 2
img 2 attached to Comidox 4S 20A 14.8V Li-ion Lithium 18650 Battery BMS PCM Protection PCB Board Module with 16.8V Overcharge, Over Discharge, and Short Circuit Protection - Pack of 2
img 3 attached to Comidox 4S 20A 14.8V Li-ion Lithium 18650 Battery BMS PCM Protection PCB Board Module with 16.8V Overcharge, Over Discharge, and Short Circuit Protection - Pack of 2
img 4 attached to Comidox 4S 20A 14.8V Li-ion Lithium 18650 Battery BMS PCM Protection PCB Board Module with 16.8V Overcharge, Over Discharge, and Short Circuit Protection - Pack of 2

Description of Comidox 4S 20A 14.8V Li-ion Lithium 18650 Battery BMS PCM Protection PCB Board Module with 16.8V Overcharge, Over Discharge, and Short Circuit Protection - Pack of 2

This protection board can not be used for lithium iron phosphate battery, xenon lamp, hand drill battery pack, electric fish battery pack, electric bicycle battery pack, baby car battery, 775 (4A) and above motor, 1W fisheye LED light!. The power range described applies to the following products: low power inverters, massager battery packs, LED light backup power supplies, electronics, solar street light battery packs, monitoring backup power supplies, and other products. The protection board measures 35*35*3.0mm, and the components are S-8254AA protection chip and D403*4 pieces. In the use of the battery will be hot, the battery rate is not applicable, this situation can not be used for a long time, the battery will be damaged quickly. Note: For discharge products above 3A, the discharge rate of the battery should be more than 3C. (Magnification formula: 1C rate battery, 2000 capacity equals 2AH*1=2A upper limit working current. 3C rate battery, 2000 capacity equals 2AH*3=6A upper limit working current).

Reviews

Global ratings 4
  • 5
    1
  • 4
    0
  • 3
    1
  • 2
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  • 1
    1

Type of review

Revainrating 5 out of 5

Small balancing charger, big cost

Garage door opener lead acid battery failed after 5 years instead of buying a new heavy duty battery I decided to use the old 18650 cells I had at home to make a battery to build . 12V battery. With this 4S protection board, I was able to build a 14V LIon battery that is half the size of the original and 4 times lighter. The protection board protects the battery from overcharging/discharging and also balances the individual cells.

Pros
  • Quality construction
Cons
  • Functionality

Revainrating 2 out of 5

Didn't work.: power converter

The product came as promised by Amazon. After installation I had no output voltage. All wiring checked. The voltage was correct at all measuring points, check the soldering points, everything is fine, then boom. Output 14.8V. Ok cool. I then tried charging to 16.8V and it cut power at 15.2V. I then tried letting it "cool down" (it wasn't hot) and tried charging it with a different charger but nothing worked. I don't know how to contact the seller but for now I'll just buy another brand.

Pros
  • Ideal for outdoor activities
Cons
  • You could have chosen a newer model

Revainrating 1 out of 5

Not only can be used with batteries.

As others (and the seller) have pointed out this does not work, if you just put in charged batteries and connect a load it will output zero volts between the P- and P+ terminals. You need to connect an external charging voltage (16.8V) to P-P+ to make the BMS "turn on", after that you can remove the charging voltage and then the BMS will output voltage from the cells. Therefore, if your application is not constantly connected to the charger, it will not work.

Pros
  • Easy to use
Cons
  • Doubtful

Revainrating 3 out of 5

One broke after a day, the second works perfectly.

Don't know why one went bad. Suddenly the network connection was gone and I don't know why. Maybe it's broken, maybe it's really fragile, maybe I damaged it somehow. I like the one that still works - a few weeks now. It was easy to hook up and seems to be working. I gave it 3 stars because I don't think I did anything that would damage the one that didn't work as it went from working to not touching while supplying 1.2A of current from a 4S IMR18650. .

Pros
  • Good product for the price
Cons
  • Almost never