A lotta to do over nothing. Just another gimmick and expense. How hard is it, really to check the water level in a battery ? It takes so little time and allows you to check for other potential problems in the battery drawers (boxes) or whatever. Things like loose or broken wiring at the battery terminals, corrosion, etc.
Wow....this couldn't be more wrong! I've been using the ProFill system for over 7 years on two different motor homes. Even if your batteries are easy to get to and you can stand right over them and fill them, it's still a messy/nasty job. You have to unscrew each cap, fill each cell checking that you don't under fill or over fill. You ultimately will spill some water which adds to your acid issues and you have to make sure you don't touch any clothing and wash your hands thoroughly when done. The ProFill system doesn't blindly fill the batteries from ten feet away. You're still able to look over your battery bay while conveniently filling the batteries.
One of the biggest causes of battery failure is that people hate to fill their batteries, so they aren't as faithful about doing it.
Not only does the ProFill system take under five minutes from start to finish to water up your batteries perfectly, it also reduces acid build up because of the cap design.
The ProFill system is one of the best products you can buy for an RV. They're expensive, but WELL worth the money.