Car Battery
check your battery water twice a Month. If you have a dry battery for car then there is no need of water butt if you have a lead acid battery then you need to check regularly as it will save you from big loss.

UPS Battery

You need to check your battery water after 10 days as if it run with no water then you will not have much backup as you required, yes if you have a dry one then you dont to fill water in it.