Date: Sat, 31 Aug 2002 05:49:58 +0000 From: "Matthew Hanson" <[EMAIL PROTECTED]> Subject: Re: [LIB] LiIon AA Batteries?
>From: Raymond <[EMAIL PROTECTED]> > >You can buy equipment that is capable of taking both standard >Alkaline/NiCAD/NiMH AA cells or LiIon cells but part of the reason why is >because the battery compartment is designed such that the cavities for >pairs of cells don't have a partition between them (and they rely on a >little ridge in the plastic to separate the cells). You can then buy LiIon >cells which are 2 AA cells wide and take the space of 2 AA cells (and so >need the space between cell cavities in the device in order to fit), hence >providing a similar voltage But from the looks of the URL Lee posted, a single LiIon AA is rated at 3.6v. This MP3 player might be able to accept a double wide set of AA batteries, but in parallel that’d be 3.6v, and in series, 7.2v. AH! The player runs 2 - 1.5v alkaline AAs totalling 3v in series. Those LiIon doubleAAs just might fit in physically with an extra .6v. Wonder if the player’s circuitry will accept that. I’d think so. >on or something ... you CAN get AA NiMH cells that are rated at 2.1AH >though so those may be worth a try first. Really! I’ll have to scout some out. >Also make sure you're charging them right, you only really get top capacity >from NiMH using a proper negative-delta charger (it detects when the >voltage curve starts coming back down again, indicating the cell is fully >charged) or some other intelligent charger. The standard 'ram this much >voltage in and just time it' sort of charger isn't much good for them (as I >found out the hard way ...). Such chargers aren't all that expensive >nowadays anyway. Now, you’re talking about a charger that’s made specifically to charge both NiMH and LiIon batteries, right? I’m guessing that LiIon batteries have to have a different charging circuit than the NiMHs, don’t they? I have a really nice little NiMH charger that seems to do what you describe. It has a red light (LED?) that goes out when the batteries are charged, after which the unit seems to shut down to a trickle where no heat can be detected coming from either charger or batteries. But I’m not sure if I may have fried it the other night. I put a set of 4 NiMH AAs (ones I got with a charger for my brother), into MY NiMH charger... and in a couple hours I walked over and found the batteries and charger hotter than all *%^$! I really don’t get that at all. But I noticed that when my brother would charge them in the charger they came with, the charger always stayed warm to the touch, had no indicator light, and always seemed to stay on. But I had always thought that all NiMH >batteries, were built to the same basic specs, and could be charged in any NiMH capable charger. Obviously there’s something different about this battery/charger set I got at a local chain store here in the USA called Batteries Plus (www.batteriesplus.com). I have a few sets of AA NiMH batteries that never heated up in my charger like that. Matt _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com ************************************************************** http://libretto.basiclink.com - Libretto mailing list http://www.silverace.com/libretto/ - Archives -------TO UNSUBSCRIBE------- Reply to any of the list messages. The reply mail should be addressed to: [EMAIL PROTECTED] - Then replace any text on the message's subject line: cmd:unsubscribe --------TO UNSUBSCRIBE DIGEST------ Do above but with this on subject line: cmd:unsubscribe digest **************************************************************
