I keep my aircraft battery on a Battery Minder full time. After a trip to the Mooney Summit a couple of years ago, when I got ready for the flight home, the battery would not start the engine. I found out that battery voltage is almost meaningless as an indication of how your battery is going to perform. Last year at the MAPA homecoming, a representative for Concorde told us that capacity tests were supposed to be done on our planes at annual, and that our planes were not airworthy when the