2 1/2 yr old 12v battery that has had good maintenance. Took rig to the shop for some routine maintenance on other systems. Battery read 12.8 . Today (5 days later) battery read 9.8v. I've read on ...
Charge it. Equalize it. Use it. Take along some money on the trip for an emergency replacement. Carry jumper cables to get you through "one night" if need be.
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