NVArt wrote:
Bought my 172N 10 years ago: had a new Gill 24V lead/acid battery in

My Gill's have lasted about 5 years each. They're easy enough to
change in the Navion and not that expensive. The only stupidity
is neither Gill or Concorde has a PMA/STC for the Navion (whose
type certificate calls out a now non-existant 1950's EXIDE battery).
So everybody has to submit a 337 for field approval or just plays
don't ask don't tell with the FAA.