When I replaced my old battery about 6 months ago I checked the bus voltage
(via the lighter socket) and found it running a bit higher than recommended
for our warm Arizona temps. Evidently running with too high a charging
voltage can shorten the life of the battery. It was relatively easy to
remove the electronic voltage regulator's cover and adjust the voltage down
a few tenths. I think the recommended voltage was around 14.1 to 14.2 for
the RG battery in a warm climate.

--
Best Regards,
Mike
http://photoshow.comcast.net/mikenoel
"Newps" wrote in message
. ..
I had a similar thing happen in my 182. I had a digital voltmeter that was
set to turn on the high voltage light at 15 volts. For the first couple
years I owned it the voltage was always at about 14.5-14.7 during cruise.
It started to inch up and occasionally touch 15 volts thus tripping the
light. replaced the voltage regulator and the problem was solved.




three-eight-hotel wrote:
It's a Cessna 172M, and the battery was just replaced in the last 6
months (not to imply that it's okay because it's new). It also just
came out of annual in February...

Other than make/model, was there any additional information you were
looking for that could be helpful?

Thanks!
todd