[SOLVED]USB Charging 2S Li ion Cell

Other Hardware General Electronics
1

Hi,
I work on a small project running on battery 18650 it is in series and I seek to recharge via a USB port but my problem is that I am not very familiar with the charging of these batteries I think to use a buck boost converter and connect it to a mp2615 but I'm lost having never made a boost converter I'm littlr freak out of mistake and I'm not even sure it's a good idea
so in summary if someone could refer me to a possible method to accomplish this or reference components it would be awesome and if you have schema to realize that you are my god

thanks by advance

2

Ask Google:
TP4056 Charging Circuit

TP4056 CIRCUIT

I don't know if you need to disconnect your load before charging it.
If so you could put a relay between the battery and your load.

3

I have big constraints in space so the relay does not pass; c
and i have two cell in series i dont think tp4056 do 2S
thanks a lot tho

4

Hi do you think this could get the job done

5

do you think this could get the job done

Are you going to fill in the values in the "simplified circuit " on the datasheet ?

6

yes I'll probably just fill in the basic schema the datasheet is pretty simple and test to see it must also look like there are plenty of things that I will not use as the HOST if you have to let it float or connect to the ground for the data pin or the termistor cut off pin i already handle that with my microcontroller x)

7

SEE PAGE 25

8

Thanks i'm going to make a quick update when i've rolled my board ;p

9

it works but lots of unbalance between the cells i recommends this one

he have balancing i rolling my roject with this finally