I have a Concorde RG35AXC. Going on my 5th year with the
battery and it still passes the annual load test with as
much margin as when it was new. It saved my butt once with
an alternator failure, which I didn't notice until after
landing. Far outperforms a conventional battery. I put
mine in before it was STC'd for a PA-32, so I needed a field
approval. Installation involved replacing the battery box
lid (it is slightly taller than the original Gill, so
doesn't quite fit under the original piper sloped top box
lid), a weight and balance change (it is 4 lbs heavier) and
a continued airworthiness instruction which involves annual
load testing. It relieves you of periodic battery service,
and battery box maintenance. It does have a lower internal
resistance, so your starter will crank faster and you'll get
a bit more time out of it in a no alternator situation. On
the flip side, the charge current can be excessive if the
battery is run down. If that is the case, the battery
should be recharged on a current limiting charger rather
than with the airplane's electrical system. I highly
recommend this battery, and wouldn't consider putting a
conventional lead-acid battery in my airplane again.

Gene Vignali wrote:

Any user experience with sealed lead acid batteries?
tia, gene

--
--Ray Andraka, P.E.
President, the Andraka Consulting Group, Inc.
401/884-7930 Fax 401/884-7950
email
http://www.andraka.com

"They that give up essential liberty to obtain a little
temporary safety deserve neither liberty nor safety."
-Benjamin
Franklin, 1759