I have 6 - 5 year old Interstate U2200 220A/H golf cart batteries that I use to power my hunting cabin. I take them out of service in December and keep them on float until about now to put them back in service. This year, I foolishly forgot to check water levels and found perhaps half of the cells with the plates showing. I watered them, charged and equalized twice and now I'm getting some low specific gravity readings on the affected cells ranging from 1.235 to 1.256. Have I killed them? Will a low SG reading in itself tell me if they are shot?
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