Hello all engineers .So long story short is i stopped smoking and on to vaping now for few years decided to upgrade and i bought dual battery mod witch is 150 w box mod but with these mods you aren't really supposed to charge the battery's inside the mod ( you can with built in micro usb ) but not advised to do so because you can burn the board inside so you have to buy lithium 18650 charger for example nitecore d2 charger ( dual slot ) 15 euros.. thats alot so....
I decided to buy components and build my own charger for about 3 euros and my own time + some leads,casing from my self and a charger i will use is samung adaptive charger 5 v at 2 amp or 9 v at 1.67 amp.
i have 2 x LG HG2 3000 mah 20 amp battery's
I will use two TP4056 at 0.40 cents each
two Holders for 18650 0.40 cents each
and one LCD red voltmeter 1 euro

There is the 5 min schematic \

The problem is that i dont know how to make it so it charges balanced ? should i connect the battery's parallel ? because the manufacturer says that inbalance shouldint be greater than 0.3v... What to dooooo ?

ENGLISH IS MY SECOND LANGUAGE SORRY GUYS AND GIRLS.

 

bump

 

If each Tp4056 charger is for one battery, then just put the cells to each pcb, and power the pcbs in parallel from the usb,Otherwise get a two cell charger pcb. Your drawing looks correct.

 

What if i connect pcb in parallel and the batterys in parallel like this ? (PICTURE)

 

It wont work, one pcb per battery cell,...

 

Thanks for help decided to do this what do you think ? i will be able to charge two batteries in parallel at 500 mah each when i have time or at night and the second option will be just to flick the swtich and charge battaries individuali and at the end (when both are charged) to balance them i m just gonna switch it to other method where the bateries are connected in parallel to balance them out
Also another question where should i connect the data cable from voltmeter ? to the positive of the battery or negative ?

 

Another question can i connect it like this ? or this ?