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I have an Ampere Time 200AH battery that I was using to power a ham radio station. Over the course of a weekend event (field day), the battery cut out 3 times. By cut out I mean the terminal voltage went to zero. Applying a charging voltage for a few seconds restored the battery to operation...

Only one radio, Icom 706, 100 watts on CW, 30 and 40 meters, only happened on 20. Steady-state current 22 amps. Dipole antenna at 38' directly above RV. Thanks for all the suggestions, I will try some of them next time out.