3S 12V 10A 18650 Lithium Battery Protection Board BMS Li-ion Charger Protection Module Anti-Overcharge/Over-Discharge/Over-Current/Short Circuit 3Pcs

Worked wonders! Converted our nursing facilities feeding tube machines that works on 12v 2amp lead acid batteries to 18650 lithium batteries..bench tested for a week draining the diy battery pack and charging it back multiple times in the our baxter infusystem feeding tube machines before sending it back to the floor for patient use..5 done, 10 more units to go.. just do remember they need to be charged 1st before its going to work.. its for safety reason they did this for it to work the very first time..there will be no voltage outputted if you don’t charge this on your first use so be aware..

I used this to build a battery it work right away one thing though it doesn't say this in the instructions it comes in a safety mode so you can connect the battery cells you MUST appy a charger to the finished battery to take it out of safety mode even just for a second you wont get an output until you do i see a bunch of people say it didnt work but you HAVE to charge it first

Others have complained about applying a charging current to the pack for it to start conducting. I mean, that's fine with me haha. I can't imagine a scenario beyond mass manufacturing where you'd build the pack and then send it off and needing it to work without charging it even once. I got my batteries off of a site and they came in at- what- 3.1 or 3.2V? Like yeah of course I'm going to charge it before I actually use the pack haha.Anyways, my reason for giving 4 stars instead of 5 is that there's a loose metal plate on top of the solder pad on the component side of the PCB. So, looking at the top of the thing, there's B-, B1, B2, and B+ right? On each one of those four solder pads there's a thin metal rectangle that's apparently in place via a thin layer of solder. It's bizarre and, in my opinion, a dangerous decision to make because it isn't obvious unless you accidentally get a bad solder like I did. I had a great solder between the wire and this weird, secret rectangle, but the rectangle almost completely detached from the PCB. I ended up heating and removing these rectangles and soldering straight to the PCB like a regular guy. If the seller could chime in on why these are here, I'd appreciate it and would consider revising my rating.

A+

I had a similar experience to another reviewer: the first board I connected charged all the batteries up to ~4.2v but afterward would not output anything. I connected the other two boards and they seemed to do nothing. They wouldn't output any power, and they wouldn't draw anything to trip the protection circuit. I thought perhaps they were tripping the overcharge protection but the batteries are each below the threshold shown in the listing and still no joy. I will continue to drain them separately and see if I can find a point where the circuit will start to charge them back up, but unless there is something I am missing, I am not holding out much hope for these.

Comidox - 3S 12V 10A 18650 Lithium Battery Protection Board BMS Li-ion Charger Protection Module Anti-Overcharge/Over-Discharge/Over-Current/Short Circuit 3PcsWorks

They are good, work well and keep the pack hovering around 12.6. Must charge through circuit in order to activate.

build large 18650 charge blocks for off grid. i use these for cell phones and small fans and LED lamps. rated 12v10a is 120w max i guess. 3s8p 16AH 200WHR 18650. low amperage used 5v2a +9v1.5a + 12v1a.makes the kids happy when they have lamps and can charge their phones and tablets for days. 18650 BMS.