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burlmart's avatar
burlmart
Explorer
May 15, 2015

opinion - costco gr 78 batts & parallax 7300 charge data

i have the parallax 7300 converter, two 1 y/o kirkland group 78 batteries (one house that is almost never used but to start genset, and one chassis). after a long day of charging 6 days back with b...
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tenbear's avatar
tenbear
Explorer
May 16, 2015
One of the reasons the battery voltage is high after charging and then drops is due to surface charge. The battery voltage you should be interested in is the voltage after the surface charge has leaked off. It could take hours to leak off when there is no load on the battery. A fully charged battery should be 12.6 to 12.7v after the surface charge has gone.

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