Before I wrote my recombinant gas (sealed) battery article for Kitplanes, I
called and had quite a talk with their chief engineer. It seems that a RG
battery likes to be discharged to a particular level (about 12.8 volts as I
recall) then recharged to 13.4, then discharged, then recharged...

This, as I was told, gets the maximum life out of the RG batteries. Simply
putting them on trickle charge is what kills them.

Jim