Post by thread:[OT:] Cell phone battery 'repurposing'

Resending with the tag ... sorry. I've got a cell phone Lithium battery that I want to use in one of my projects. This particular battery is Motorola SNN4814, 3.6v, but I think my questions applies to many other types as well. The battery package consists of a proper battery and, presumably, some protection circuit, and has four terminal plates. My questions are: What these four lines are used for? Is there any freely available specification applicable to this thing? What would be a better way: to use the battery package as it is, connecting it through the existing 4 lines, or to get rid of the electronic circuit and use a bare two-terminal battery? (In latter case I will have to supply some kind of protection circuit by myself). Have somebody used these batteries, and how? TIA Arkady -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spam_OUTlistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

> I've got a cell phone Lithium battery that I want to use in one of my > projects. This particular battery is Motorola SNN4814, 3.6v, but > I think my > questions applies to many other types as well. > > The battery package consists of a proper battery and, presumably, some > protection circuit, and has four terminal plates. My questions are: > What these four lines are used for? Is there any freely available > specification applicable to this thing? > What would be a better way: to use the battery package as it is, > connecting it through the existing 4 lines, or to get rid of the > electronic > circuit and use a bare two-terminal battery? (In latter case I > will have to > supply some kind of protection circuit by myself). > Have somebody used these batteries, and how? Generally the best way to go about it is to find out the datasheet of the chip in question and deduce the circuitry. There is no "standard" that manufacturers follow. The chip itself is often more then just protection, for some batteries the chip IS the battery charger, you just supply the "battery" power and it charges itself, the extra lines used for status checking by the host. TTYL -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservKILLspam@spam@mitvma.mit.edu with SET PICList DIGEST in the body

Herbert Graf 15:37 2004-05-14: >> What would be a better way: to use the battery package as it is, >> connecting it through the existing 4 lines, I believe ther is some kind of standard, just guessing I see Microchip makes three "Fuel Gauge" chips, the newest: http://ww1.microchip.com/downloads/en/DeviceDoc/21793a.pdf You see it use 4 terminals including the battery Asit is a motorola phone, go check motorola semi.. I men aON semiconductor website if they have chips for batteries. /Morgan -- Morgan Olsson, Kivik, Sweden -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body