I installed two Odyssey PC545 batteries during the build in May 2008.
First flight was back in February and about a month ago I thought I sensed a little less cranking power on startup.
On start on the last flight, the prop would not pass through the compression stroke so I waited a bit, hit the starter again
and even through there was a bit of hesitation, motor started normally. So my uneducated guess is that these batteries are tired and have lost a lot of there cranking power. They have always been maintained on an Odyssey Battery Minder and with a check on a battery tester, they're still in the green. Anyway, two new PC545 will be installed today.
Everybody else having good experience with their Odyssey batteries?

Angier Ames
N4ZQ