My personal experience with batteries, for what it is worth; When I bought the coupe it had a 35 amp Concorde in it. It lasted 9 years. I now have a 25 amp GILL in it and have to keep adding water to three of the cells about every three months.
I have upgraded the generator from the piddling 13 amp generator to a 25 amp generator and now have the required 15% ( or whatever) more amps generated than consumed at peak consumption time, which is when I am coming in for a night landing, have GPS, radio, landing lights, strobes, MRX and transponder all working at the same time. the problem is that I have the engine throttled back to 1000 rpm or maybe 1500 rpm so the generator is not really putting out 120% of the consumed amps. It sucks when your GPS goes off on the approach... So the 35 amp battery seems to make more sense. In the other coupe I have a 60 amp alternator that should put out enough amps at 1000 rpm to keep everything running bright even with a 25 amp Concorde behind the seat. AF. N87333 N94694
