Battery Tenders; Winter Storage

SouthArk370Z

As far as freezing goes, it's the concentration of acid that matters (indirectly measured by battery charge; full charge = greatest concentration = lowest freezing point) not the amps that the charger/tender puts out. As long as the tender will keep the battery fully charged (shouldn't be a problem unless your battery is in bad condition), chances of freezing will be minimized. I don't recall what the freezing point of battery electrolyte is but I've seen -30F with no freezing problems (it cranked real slow, but didn't freeze). If you think your storage area will get below that, use a heater.

Edit: looked it up and a fully charged battery (SpG = 1.265) is good down to about -75F. At 75% charge (SpG = 1.22; 12.4V for conventional Pb-acid battery, 12.8 for maint-free), you can get down to -35F before freezing.

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