[Sal Gerace]

Not many want the acid in the compartment,but... The aircraft batteries have taller caps with a check ball in them so you should not have any laekage. But if you do like I did and have always done which is charge my betteries with the caps loose. Like I explained above this could boil over the battery. With these caps I would just leave then tight.
Gil alsosells a Gil35S which is the sealed version of the rebat size battery, but the caps are not as tall unlike original rebats.