I can see you two have no real experience in field NiMH. I hope hear your opinion after you do some experiements. Your comments here are only by your "feeling and reading", that are often differed from the reality. By my lesson, what you described here, such 1-7, 05.C rate, are simly only existed on paper. ----- Original Message ----- From: "Philip Pemberton" To: Sent: Saturday, August 27, 2005 9:32 AM Subject: RE: [EE]: NiCd/NiMH Burp/reflex charging (was [EE] Claimed new method to fast charge NiCds) > In message <570CCF7BBB512341BA0EBA19E95084FB61D8@server.MicroBrix.local> > "David Van Horn" wrote: > > > Typical fast charge is around 1C, with a range of 0.5C to 2C. Outside > > this range, the end of charge signals will become less distinct. > > 1C it is then. Guess I need to find a 2A PSU. > Am I right in thinking that trickle charging is actually bad for NiMHs? > > > Check the cell specs carefully. > > If they are cheap Chinese cells, I'd advise against anything faster than > > 0.5C. And I'd suggest a face shield and gloves. > > Japanese actually. Kodak 1600mAh, "Made in Japan for Eastman Kodak Company". > Very nice cells actually - certainly better than the Chinese-made Uniross > junk I used to use in the digicam. > > > 1: Final backup, a timer that simply counts to say 120% normal charge > > time. > > 2: A pipo over temperature cutout made into the battery pack. > > 3: Absolute temperature of > 40C > > 4: Rate of rise of temperature > 1C/min > > 5: Absolute voltage > 1.6V/Cell > > 7: Negative delta V of a few mV/Sec > > Is it worth monitoring the current going into the cell, or is that not a > reliable way to detect end of charge? > > > Good resources, though somewhat conflicting: > > > > McGraw-Hill's handbook of batteries > > Sanyo and Panasonic data sheets. > > Data sheets from your cell manufacturer. > > Data sheets on charge ICs from Galaxy power. > > Data sheets from the Cadex web site. > > Ooo! More light reading for bedtime :) > > Thanks. > -- > Phil. | Acorn RiscPC600 SA220 64MB+6GB 100baseT > philpem@philpem.me.uk | Athlon64 3200+ A8VDeluxe R2 512MB+100GB > http://www.philpem.me.uk/ | Panasonic CF-25 Mk.2 Toughbook > ... DisneyLand: A people trap operated by a mouse. > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist