From: "Gerald Maroske" <gum_at_exmail.de> > Doubling amps can mean that your battery pack cannot provide enough > current. Normal PANASONIC NiCD 2,2Ah cells failed when currents of 4,5 A > were needed in my tests. [...] > > When those are used and your pump requires 12V here is the next problem. > If you charge/recharge those cells, each cell has a slightly different > capacity which may result in HALF of the given Ahs after several > load/reload cycles. When investigating sealed lead acid and AGM cells for use in a pump, I stumbled on this web page (it's a pdf document): http://www.stagewireless.com/PDFs/Battery_Selection_and_Maintenance_Guidebook.pdf It is intended for the theatre and music business, but the battery info seems good in general. It explains what Gerald has experienced - that batteries have a discharge rate limit (no more than twice the amp-hour rating) and rules on charging, discharging etc. Since I'm not an expert, I can't vouch for the accuracy, but it seems reasonable and is easy to understand. It made me realize I needed a bigger battery than I initially thought. Mike (Now if I could only find a local source for such batteries...) *************************************************************************** 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 Wed Mar 13 2002 - 09:36:31 PST
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