Battery Replacement

[AZzAROo]

hello everyone

i have custom  mod with lipo 14.8V 4s 
after two yaers my Battery on my custom  mod  is not working and after tast

on EScribe in Theme Designer i found the charging on cell 2 is very very low 0.0007V 

now after this i want to buy new one same 4s lipo but i have few questions
1.this is ok if my Battery not working after two years ?( i uesd this mod one and half years on my daily but after this i dont used this mod something about 6 Months until yesterday 

2.what the most Recommendations Battery ( my Battery 10.5 height on 4.5 cm width this is the max i can put this mod box ) 

3.after one and half i charging my box mod with my pc usb i want to buy External Charger waht your Recommendations 

thank you for all 

Edited January 11, 2021 by AZzAROo