You should check, but my understanding is that the RG batteries may only
last 2-3 years, and that the decreased life is a trade-off compared to
normal lead acid batteries.

Man, I hope not. At $162, this battery ain't cheap.

Anyone got any real-life numbers on this?

For what it's worth, I was told to change the battery on the Extra (by
necessity an RG) every two years

Why would they tell you to replace a battery based on the calendar? If it's
still cranking fine, what other parameter is there to worry about?
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"