Help! Making a Li-Ion batt pack, please help!

[Survivalism]

Ok so i am making a custom battery pack for a 12 volt situation, my plan so far is to use 18650 3.7 volt 2400 mah protected li ions.

Im going to put 4 in series, and then 4 packs in paralel

This will give me a 14.8 volt 9200 MAH pack, ill then use a voltage regulator to drop the voltage to 12 volts.

Now to my questions...

If u use protected batteries do i still need to put a protection circuit module inside the battery?

How can i go about charging this battery pack in the cheapest possible but safe way?

If all goes well i am planning to sell these battery packs w/ chargers so cost is the biggest factor ( besides safety of coarse )

Thanks a TON for anyones help.

 

[Elendil]

Did you try posting this in the Modders forum? They are very knowledgeable over there.

 

[nicowolf]

This will give me a 14.8 volt 9200 MAH pack, ill then use a voltage regulator to drop the voltage to 12 volts.

Are you making car bombs again? j/k

You might want to check this out. They have other chargers and some battery packs as well.

Smart Charger (0.5A) for 14.8V Li-ion/Polymer Rechargeable Battery Pack - CH-UNLI0104A-4

 

[Survivalism]

Thanks a ton nico, that charger so far is my first choice.

I thought about putting it in the mod forum but this is not e-cig related so i put it here hoping i would get some input.

I am making a battery pack capable of powering a vaporizer ( not our kind of vaporizer )

The biggest question i have now is do i need put a protection circuit on the pack if i used the above charger, and protected batteries? If i do need the protection circuit then i could just use unprotected batteries right?

Thanks a ton guys, honestly.

 

[nicowolf]

I think if every individual cell had its own PCB (the protection in a protected battery), then the pack wouldn't need to have one. You would, however, need to charge for a little over 19 hours with a battery pack of that capacity. I would not recommend trying to charge faster as li-ion does NOT like to fast charge.

 

[Survivalism]

Ok thanks a ton, new question:


If my device draws 12 volts at 800 ma, that means a 9200 mah battery would last around 9200/800 = 11.5 hours.

Is this correct? Thanks so much for your help nico!