Awrite my interstate battery even tho one step up from original size rating (mine 600 cranking amps?) and it's a type for hot climates (Hawaii) all should be good with it... I think Firestone's testing meter reading showed 550 amps... My gut is beginning to guess the ignition switch or the use thereof could very well be the (infrequent) poor starting issue... It's an old switch and my wrist & reflexes are 70 years old too... I'm hoping that a firm, good, solid, quick, full twist of the key will prevent the dead battery syndrome... It might be me not perfectly turning the key in the best way possible for the old switch to make good contact..? Plausible..? We shall see... I'm left handed, so turning the key requires using the less coordinated right hand; perhaps some ginseng will fix things..? LOL