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"Roger Long" wrote in news:wxI0h.11440$0L1.9288
@twister.nyroc.rr.com: These two year old batteries get pretty light use with a 15 hp diesel, a few lights, and frequent dockside charging from shore power. I don't leave the charger on all the time so they don't micro cycle but they seldom get pulled down very far either. I don't advocate constant charging on batteries that are stored. I recommend a SIMPLE automatic shutoff charger put on them overnight ONCE a month during the storage period, with the batteries completely disconnected so there's little external leakage over the dead period...just disconnect their terminals. ONE a month, not a continuous trickle which usually results in them gassing with a little overcharging, no matter how much a boat dealer charged for the chargers...(c; As to pulling them.....they should be stored ABOVE 0C, so there's no possiblity of them freezing, even if discharged inadvertently. AGMs and gelcells have no place to expand to all wadded up like they are so anything the might freeze them will simply destroy them. If the boat's going to sit on the hard with no internal heat in -20F winter...pull 'em. Another factor might be a self-preservation issue. Batteries are always subject to internal shorting...and subsequent explosions. If anything warps a plate...like really cold weather...a simple plate-plate short will blow the thing apart, turning the acid electrolyte into a steam explosion, distributed evenly over everything left in the boat. You have to weigh that $70 against this Worst Case Scenario....It's your call...(c; (If you ever get a chance to look around in a boat the battery exploded inside of, please take the time to look around. It never ceases to amaze me how it can etch a fork buried in a tightly closed drawer on the other end of the boat from that battery!) -- -- (shameless tagline) -- If you're sending someone some Styrofoam, what do you pack it in? |
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