12.6V battery pack, 3xcell phones battery pack. HELP!

Dear BLF battery experts;

I bought this 12. 6V battery pack for charging my cctv camera and monitor:

It appears that this pack is made of 3 same 2000 mah cell phone batteries:

Thing that is bothering me:

Is this battery pack protected?

I mean does this cell phone batteries have some kind of internal PCB that I cant see?

Please help I am very concerned running this cell because it looks like unprotected to me.

I am concerned because I had similar battery pack but my old battery pack as you can see below has built PCB. This kind of PCB kicks at 10,4V and at 12,9V:
Old one:

Anyone?

Yes, there is pcb protection inside. I checked on my used battery from no-name China phone and the battery protection was there. OVP was set to 4.25V.

First post and you already helped someone :)

Welcome to BLF!

Just to confirm, there is a protection PCB in those phone cells.

Thanks guys...

This is good to know for all of us because we can make our own battery packs out of quality smartphone cells.

Cell phone batteries = protected

Flat pack Li Ion w/o the board = non protected

Way too much liability to not have battery protection on cell phones

dani_cj great post!

<p>Another tip, if the connectors have 4 leads, it surely</p><p>is protected. Not sure about that 3 leads though, must be for grnd.</p><p>Most if not all phone batteries have 4 leads. The other 2 leads must</p><p>be for internal clock?&nbsp;</p>

Another nice tip.. Will try to build out my own soon. Just need to buy input/output connectors for 12V charger.

Hmm… I have a 55W HID spotlight that running off a build in 12V SLA battery. Does anyone think that I can hook up battery pack like this in series and replace the bulky SLA battery? I know running lithium batteries in series is a less recommended way to go with but since they have protection circuits I guess it should be okay?

But can they handle 4-5 amp draw? If the cells can handle it, I don’t think the pcb can.

IMHO, the best solution for big lights are the drill battery packs. They already have a BMS on board and they can quick charged. They are built out of IMR’s and can really supply high current levels. Here is a big light I built using an 18V pack.

Here is another that I will try to run on a 12v pack, although it may not quite work out.

Thanks for the advice guys. The drill battery packs do look like a good solution.

This is interesting question... If we put 3 phone cells in parallel(6000 mah in small package) could this be used for 4-5A 7135/7138 nanjg driver?

Can you help me to see if the below battery packs can be used in my 55W HID spotlight?

  1. 19.2V, 3Ah, Nimh battery pack
  2. 12V, 2Ah, Lithium batteries
  3. 12V, 9.8Ah, Lithium battery pack. (but 1A to 2A of discharge current only ?)

Thank you very much.

All of those that you linked to are clones of the originals. I would expect them to perform very poorly. IMHO not worth considering.

I am sorry, I am just noticing that you are in Malaysia. Here in the U.S., I have access to the recycle bins and can find loads of tool packs, some of them in like new condition.

Yes, it is not really easy to have access to these electronic parts in my country, especially in where I live. This is why I need to search them online and probably from some China sources…

Sounds a lot more plausible than drawing 4-5amp in series.

Yes. 3 batteries in series (2000 mah) would work very short period of time in high power flashlight. No sense in doing that.

Parallel should be different story. 6000 mah should be good for longer runtimes... Phone cells comes in small package.

So for amc 7135 drivers we would need 2 x female dc adapter and one male dc adapter. 1x Female out should be on flashlight which would be used for battery pack male dc adapter, and other on battery pack which would be used for charging of batteries.

There are lot of fast chargers on the market for that mission (1-2A).

I have also been thinking about this types of host below... My goal is to make hunting flashlight with picatinny rail attachment driven with smallest possible battery pack. So in this type of host I could shorten main flashlight tube, solder picatinny rail clamp, fit shorter battery pack inside, and of course change head with quality aspheric flashlight(lets say newest uniquefires). And final product should be 500kcd light in short package with acceptable runtime because we no longer depend on quality of single 18650 battery because we could have even better 3x3000 mah phone batteries in parallel inside for total of 9000 mah.

What would possibly be the problem if we use this one?