It should become quickly apparent that I don't like batteries much and they don't like me. But here's the situation. I have two batteries on my 356. No. 1 is a "cranker" designed for starting the engine. No. 2 is the deep-cycle marine kind designed to run electronics, etc., for a long time. Both are less than a year old, both check out (the yard tells me) on battery meter for both charge and depth (strength?) I'm in a slip and normally leave the charger on with the batt-switch on Both. Charging time exceeds usage time probably by a factor of 100 to 1. The built in meter in the panel shows each batt at 13 or so volts. And No. 1 does everything it is supposed to. But No. 2, argh. Flip to No. 2, the radio stays on. Flip on another small load, like a sump pump, and the volt meter drops to 3 or 4, panel goes dark, there is nothing nowhere. Reset everything, take off the load, and the meter again shows 12 or 13. What little devil is bedeviling me? Is this a poor connection somewhere? I checked the terminals and will do so again, but it is quite aggravating. Thanks in advance for any tips.