What should be the maximum difference of voltage  between the cells of a fully charged battery?
I have a 3s lipo which reads the following on my multimeter.- 4.20,4.21,4.18 and my multimeter says that total voltage is 12.66. That doesn't add!
No signs of puffing on the battery, nearly 15 to 20 cycles done.
Is there any problem with my charger or my multimeter?