Tord Eriksson wrote: > SLAs and othe lead acid batteries are great on amps, with fairly > constant efficiency over time, while NiCDs and NiMHs are easy to > overheat, unless you keep the amps down, or cool them well! > Heat-losses are an effect of amps, squared, so you'd want low > amps and high voltage! Always put a fuse on the pump. My pump, rated at 1A has a 2A fuse inside the battery case. This is one reason I recommend the Attwood 625 - other brands need much higher currents - 3.5A are not uncommon! > For bilge pumps I think Li-ion batteries > would be ideal, as they don't discharge over time nearly as fast > as other types, including lead-acids. True, but I find that the high-capacity NiMH that are available now are fine in most kayaking uses. I've left my batteries in the kayak for over a month with no noticable decrease in pumping power. Li-Ion, OTOH, are quite a bit more expensive and the combination of a good, general-purpose Li-Ion with a good charger is hard to find. Given that NiMH AAs are common and good, fast chargers are readily available, I'd only recommend Li-Ion for specific purposes, notably extended cold weather paddling. If you're rich and like to reserve bragging rights, go for Li-Ion :-) Mike *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Thu Apr 19 2007 - 13:24:43 PDT
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