I just removed my old Gill G-35 from my Archer and I'm waiting for a
Concorde RG35-AXC from Spruce. This non-sealed unit lasted a few months
past 8 years while being flown about 2 hours per week. According to some
spec's I was looking at (on the Concorde web page?) the sealed batteries do
not require a battery box and can be mounted in any position, so I guess
they are not expected to crack and vent.

The failure mode for the old battery was a shorted cell spewing electrolyte
against the inside of the battery box lid. Since it ate away the paint it
would be easy to pick up on a routine inspection of the battery.

Regards,
Mike.

"nrp" wrote in message
oups.com...
What are other people's experience with battery life?

C172M - I've always gotten at least 8 years from the last three
batteries. Just never let the plates get exposed to air, never let it
get discharged & keep the top clean. I do not put any trickle charger
on it unless everything is down for many weeks. I also have never had
to use the ground service plug - except when the FAA Certified Repair
Station left the master on after an annual.......