This is a multi-part message in MIME format. ------=_NextPart_000_0007_01C167E5.0CAF95D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi everyone, Last post for tonight, hope I haven't rattled you too much, I hope that = something useful / interesting comes out of each for at least somebody. = Some questions on charging (and discharging?!?!) lithium ion batteries. = I've been reading through the wear hard archives, but i was wondering if = anybody has been doing this sort of stuff long-term and has noticed any = effects. the archive posts are from when doug was testing out some = parallel charging etc... a) does putting two 3.6v lithium-ion battery packs in series equal a = 7.2v pack of the same amp-hour rating for all charging / discharging / = usage purposes? i assume they are just made up of cells inside and 7.2v = packs just have twice the cells, so it should be the same deal? b) are all lithium-ion cells essentially the same, i.e. i have a generic = 7.2v lithium ion charger for various models of camcorders (+ = infolithium), can i use this to charge 7.2v mobile phone lithium-ion = batteries or is there something I should know? (assuming that all = contacts except for + and - are ignored as with infolithium) c) excuse my ignorance, but if lithium-ion cells suffer no memory = effect, why would we ever discharge them? d) has anybody experimented long term with charging or discharging large = numbers of lithium-ion batteries in parallel? i would need to charge = perhaps 8 or 16 pairs of 3.6v cells (as 7.2v cells). i'm guessing this = drives up the current a bit so depending on the charger i probably = wouldn't be able to do more than 2 or 3 pairs at once. e) i've looked on the web, but can't find anything. why do two = lithium-ions in parallel not invisibly appear to a charger as a single, = large capacity cell? if you have a website with any info on this i'd = appreciate it! f) i know many of you run a pair of infolithiums in series to get 14.4 = volts, do you all dissasemble that for charging individually, or is it = possible to charge "14.4 volt" lithium ions? g) are there any reccomendations for diode / bridge rectifier setups to = use / charge many many infolithium cells. I keep reading about these to = stop the batteries from trying to charge each other when in parallel and = the like. I understand the principle of a diode / bridge rectifier, but = i don't understand the circuit to arrange this. would this allow many = cells to be charged more easily without destroying chargers/ Thanks for any help with any of the above! Nick ------=_NextPart_000_0007_01C167E5.0CAF95D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 5.50.4807.2300" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>Hi everyone,</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Last post for tonight, hope I haven't = rattled you=20 too much, I hope that something useful / interesting comes out of each = for at=20 least somebody. Some questions on charging (and discharging?!?!) lithium = ion=20 batteries. I've been reading through the wear hard archives, but = i was=20 wondering if anybody has been doing this sort of stuff long-term and has = noticed=20 any effects. the archive posts are from when doug was testing out some = parallel=20 charging etc...</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>a) does putting two 3.6v lithium-ion = battery packs=20 in series equal a 7.2v pack of the same amp-hour rating for all charging = /=20 discharging / usage purposes? i assume they are just made up of cells = inside and=20 7.2v packs just have twice the cells, so it should be the same=20 deal?</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>b) are all lithium-ion cells = essentially the same,=20 i.e. i have a generic 7.2v lithium ion charger for various models of = camcorders=20 (+ infolithium), can i use this to charge 7.2v mobile phone lithium-ion=20 batteries or is there something I should know? (assuming that all = contacts=20 except for + and - are ignored as with infolithium)</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>c) excuse my ignorance, but if = lithium-ion cells=20 suffer no memory effect, why would we ever discharge them?</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT><FONT face=3DArial = size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>d) has anybody experimented long term = with charging=20 or discharging large numbers of lithium-ion batteries in parallel? i = would need=20 to charge perhaps 8 or 16 pairs of 3.6v cells (as 7.2v cells). i'm = guessing this=20 drives up the current a bit so depending on the charger i probably = wouldn't=20 be able to do more than 2 or 3 pairs at once.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>e) i've looked on the web, but can't = find anything.=20 why do two lithium-ions in parallel not invisibly appear to a charger as = a=20 single, large capacity cell? if you have a website with any info on this = i'd=20 appreciate it!</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>f) i know many of you run a pair of = infolithiums in=20 series to get 14.4 volts, do you all dissasemble that for charging = individually,=20 or is it possible to charge "14.4 volt" lithium ions?</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>g) are there any reccomendations for = diode / bridge=20 rectifier setups to use / charge many many infolithium cells. I keep = reading=20 about these to stop the batteries from trying to charge each other when = in=20 parallel and the like. I understand the principle of a diode / bridge = rectifier,=20 but i don't understand the circuit to arrange this. would this allow = many cells=20 to be charged more easily without destroying chargers/</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Thanks for any help with any of the=20 above!</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Nick</FONT></DIV></BODY></HTML> ------=_NextPart_000_0007_01C167E5.0CAF95D0-- -- Subscription/unsubscription/info requests: send e-mail with subject of "subscribe", "unsubscribe", or "info" toWear-Hard Mailing List Archive (searchable): http://wearables.blu.org please, Please, *PLEASE* don't subscribe through a forward/false domain
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