there are two types of battery water.
as battery water is produced to a certain standard,
there are two main methods in use today to produce it.
one is Distillation (air suling la) which is water vapor. However, equipment tends to be hot and large.
so in comes deionisation. which, unlike distilled water which is "created" pure, ions are removed through the use of activated filteration systems...
these as u can see apply to battery care.
radiators... haha, ur guess which one goes in best. distilled la. not deionized..minerals and all..