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DC charging circuit question (Vs=12v charging 18650 batteries in series (7.4v total)

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hoghunter

Member
I want to plug a 12v DC charger into a jack on my device to charge (2) 18650 batteries in series (7.4v). Will this safely charge the batteries 'as is' or will I need a voltage dividing circuit to lower the Vs down from 12v. If I do need a voltage divider circuit, what voltage should I be bringing the 12v (Vs) down to?
Thanks for any help and guidance.
 

MikeMl

Well-Known Member
Most Helpful Member
Stop, read, learn, about the special requirements for charging Lion batteries... ( You have a lot of reading to do)
 

Pommie

Well-Known Member
Most Helpful Member
Improperly charging Li-ion batteries will result in fire and maybe an impressive firework display. Don't do it.

Mike.
 

hoghunter

Member
Wow!! Glad I asked. Thank you so much for the heads up! I will do some research and look online for charging modules. I have (3) 18650 batts in series (11.1v), in a holder that I have charged several times to power some prototypes for testing. I have had no issues, luckily. I will definitely heed all of your advice. Safety first!!

Thanks again
 

Nigel Goodwin

Super Moderator
Most Helpful Member
That looks like just what you need - protects against overcharging (and the resulting fire risk), and protects against over discharging, ruining the batteries.
 
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