Automatic Battery Filling System

[Trim50]

My batteries are located under the seats in the galley and half of them are located in such a way that it requires me to pull all the batteries out just to fill them. Needless to say, I've lost a few years of good battery life due to the effort needed to keep them top-off.

I've been thinking about buying an automatic fill system for $319 and figured it would pay for itself in the first year. Does anyone have one of these systems, and if so, does it do the job?

http://www.thesolar.biz/Battery_Filling_Systems.htm

[Harbor_Pilot]

This filling system is the answer for the elimination of all these problems. It's not automatic... you must operate the system but, it fills all your cells in one simple operation.

An automatic system that is not automatic; what am I missing here?

If the batteries are out of sight, and you do not remove the caps; how do you know if each cell is filled within the acceptable range, not under or over full?

[Trim50]

Balanced valve:

http://69.94.120.118/graphics/valve_...w_it_works.pdf

I'm not sure how they got a patent, the balance valve has been around for a couple hundred years.