Charge two 18650 using single tp4056

Thread Starter

ep.hobbyiest

Joined Aug 26, 2014
201
I have two 18650 batteries to charge using TP4056. I have seen in at many posts like people are using individual tp4056 charging module for each 18650 battery and also observed like some are using single module to charge two 18650 battery.
Is it fine to use single tp4056 charger circuit to charge two 18650 batteries ?
What are all the parameters do i have to consider while using single TP4056 ?
 

LesJones

Joined Jan 8, 2017
3,709
You should be able to use a single TP4056 to charge two 18650 cells connected in PARALLEL. If they are in series you would need two TP4056s each supplied from separate ISOLATED power supplies. Before connecting the cells in parallel they must have the same voltage. So you will probably have to charge or discharge one of the cells until they have the same terminal voltage.

Les.
 

LowQCab

Joined Nov 6, 2012
2,055
If You put both Batteries in parallel, they will charge just fine,
but it will take twice as long to charge the Batteries.

The TP4056 is so cheap and so small,
that there is no reason not to use 2 Chips, one for each Battery.
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Thread Starter

ep.hobbyiest

Joined Aug 26, 2014
201
Okay. if i used single TP4056 module then i will have to use it in parallel. and for series i will have to go with two charging modules.
 

LowQCab

Joined Nov 6, 2012
2,055
Correct,
I recommend using 2 separate Chips, one for each Battery.
Read the Spec-Sheet carefully, do not exceed 1-Amp Output.
Do not insulate them, they may get Hot and fail.
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