To charge 2 batterys in series

Other Hardware General Electronics
1

Hello everyone,

In my project i will use two 3.7volts 18650 batterys in series for supply the robot's power.
I will use a TP4056 USB 1A 18650 Lithium Battery Charger Module for recharge the batterys, like you can see on the attached file.

Shema is ok or should i put a kickback diode somewhere ?
Thanks :slight_smile:

CHARGING_SHEMA.jpg
CHARGING_SHEMA.jpg800×1067 117 KB

2

You have a short circuit between the +ve and -ve terminals of the charger at the junction of the two batteries. Do you really think that will work?

Steve

3

slipstick:
You have a short circuit between the +ve and -ve terminals of the charger at the junction of the two batteries. Do you really think that will work?

Steve

ohh yes you are right... thanks, there is any solution ?

4

maybe should i put a switch beetween the 2 batterys ?
and think about switch-off when it's charging and switch-on when i use the robot.
Can i use a MOSFET as a switch to do this job ?

5

Switches have no effect - you simply cannot charge two 3.7 volt batteries in series from a 5 volt supply

Using a DPDT switch or DPDT relay you can charge one battery at a time.