HP Forum Archive 19

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on nicads Message #1 Posted by db (martinez, ca.) on 5 Aug 2010, 10:09 p.m. from the font of all knowledge: http://www.straightdope.com/columns/read/349/do-nickel-cadmium-batteries-develop-charge-memory-if-not-fully-discharged it sounded ok, with the exception of the damage he spoke of being the reversal of polarity and his not mentioning the possible wives tale which i heard: stating that the memory effect (or false memory effect) is not that the batteries won't charge fully - it's that they won't discharge fully. i mostly use nimh cells now, so it's not a big deal to me. i just want to read what someone who knows a lot may write.

Re: on nicads Message #2 Posted by Vieira, Luiz C. (Brazil) on 6 Aug 2010, 12:10 a.m., in response to message #1 by db (martinez, ca.) Hi, db; all I'd add about that is something mentioned by Katie Wasserman a couple of weeks ago: NiMH cells work better/live longer if kept charged at 60% +/-15% of their full charge, based on Prius battery regulation. Please, follow this thread; Katie's is one of the last two. I sometimes find only NiCad's when searching for certain types, like the ones to rebuild the 82143A batteries (and related cases: Topcats, 82162A, etc.). I never found NiMH Sub-C batteries where I searched for them. Cheers. Luiz (Brazil) Edited: 6 Aug 2010, 12:20 a.m.

NiMH Sub-C batteries Message #3 Posted by tim m. on 6 Aug 2010, 2:12 a.m., in response to message #2 by Vieira, Luiz C. (Brazil) I've bought many from BatterySpace.com, mainly for rebuilding Roomba battery packs (with 12 cells in series, usually one or two die, bringing down the entire pack voltage enough that I get very little operating time from the robot). -Tim Edited: 6 Aug 2010, 2:24 a.m.

Re: NiMH Sub-C batteries Message #4 Posted by designnut on 6 Aug 2010, 12:21 p.m., in response to message #3 by tim m. I have hadsuch good reesults with Sanyo Eneloop low discharge AA cells I use them in most appliances. I used to have 2 4 station chargers on nearly full time, now one used rarely. I read there has been further improvement lately in the self discharge rate. I use them in shells to substitute for D cells in one application where I get long life. I had a portable telephone that would lose it's nicad charge in 2 days. I bought some NiMh cells with tabs ans replaced them. They are satisfactory after years of use. Sam

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