Battery
So, I ended up with using lipos 
This battery is made of two hrb 3s 5000mAh lipos.
totals: 6s 5Ah, 111Wh in total, the same old 750g
I attached epcos 100k thermistor (from my fried ender 3 
) to the most suspicious cell. Not only because battery temperature is important, but also because I always wanted to 
Next, I placed foam between packs and covered them with electrical tape. I know that I would better use shrink but it’s kinda hard to find it here and waiting for this thing from China is kinda bruh to my taste.
Orange wires are thermistor, balance wires remained as is:
The only thing left to do is to solder xt60 to the output