Couldn't have said it better. A volt watch or volt meter will only tell you registered voltage. Get a load tester and run it two or three times. My habit is as soon as I get the charger unplugged and putaway(always are charging on the way to the field) , Irun the load test a couple of times and watch for any significant drop in voltage. For about $25.00 you can get a good one and that's a small insurance policyprice from losing a plane due to abad battery nearing failure!