Ooops, I keep forgetting to email the list. Sorry Joerg. Bob
-------- Original Message -------- Subject: Re: [avr-chat] Li-ion cell phone batteries Date: Sat, 29 Mar 2008 19:57:35 -0400 From: Robert L Cochran <[EMAIL PROTECTED]> To: Joerg Wunsch <[EMAIL PROTECTED]> References: <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> It's very likely that your black and red wires are the battery poles, > and the blue one goes to a thermistor (against black, the negative > pole) that is used to monitor the battery temperature when charging > inside the cell phone. This is because the cell phone charger circuit > wants to charge with the highest possible current (so the charging > time gets as short as possible). If you reduce your current to a safe > value beforehand, you are not strictly required to also monitor the > temperature. > > Okay, the connector looks like a really small 3-pin female JST connector. I could cut the connector off the wires, and solder on a two-pin female JST connector I happen to have -- if it is safe to solder those wires, I mean...the heat from a soldering operation on the battery wires won't explode the battery, will it? Assuming I can safely solder the positive and negative wires to a larger-sized 2-pin female JST connector, I can then connect the battery to my lipo charger using the same bananna plug adapter I use for my 11.1v lipo batteries. I don't have a datasheet for the battery -- my Google searches don't seem to find a "Power Products" website. I can set it up for not more than 800 mAh and 1C charging. That charger is pretty smart and I think it will suggest a charging voltage and current. I can put everything in a 9 mm ammunition container I happen to have. Does all this make sense...or should I just buy a battery from Sparkfun which comes fully documented? I do in fact have a bench supply. It's a BK Precision 1670A and right now I have it set up for my lipo charger. I really love the lipo/li-ion batteries because they give me the freedom to move around with my projects. Thanks Bob _______________________________________________ AVR-chat mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/avr-chat
