battery top up

[meek.tv]

looking at my main battery it the fluid level seems to be right down on the "lowest" level, do i top it up by opening each of the caps and putting a bit in each or do i just fill it from the one on its own that is set a bit further forward to the others?

[g8dhe]

Each cell is independent and needs to be filled on its own, otherwise the battery would short out !