However car batteries can be used very effectively for amateur radio
operations by using them as a peak current provider in conjunction with

A certain g7 used to charge his batteries on night-rate electricity and
then run his bbs off them during the day.

and that was in the mid 90's.
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Above info is possibly NOT relevant . The topic is : Running amateur
radio equipment from a CAR battery.

Frank GM0CSZ / KN6WH