Is killing batteries three times too much?
I use a set of 6V golf cart batteries from Costco. The pair that is in my rig now is two years old and they only last a couple of nights before the low voltage alarm on my CPAP starts sounding. When t...
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Put a hydrometer on them, sounds like a bad cell (or more than one). If so they are toast as no amount of charging is going to last, they will drop off under load. Hydrometers can be had for around $10 and are very handy to have.
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