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Default device to protect from draining a 12 volt battery

(Larry W4CSC) wrote in message ...
You're not going to run the car battery down charging the cellphone 24
hours a day,


Hello Larry.

Actually looking to maintain one of those portable power
supplies/jumper boxes with my alternator system by feeding it 12 v as
I run.v I also charge 8 nimh batteries used by my radio sometimes too.