mobile phone battery help please

bilbo_2

hi all can someone help me please

i have a lithium mobile phone battery that i want to use as a power supply

http://img.villagephotos.com/p/2007-11/1287814/battery.jpg

which two pins do I solder wires to as to charge the battery, and which two do I use to take the power from the battery



Thanks

espresso

The outer ones that have + & - markings.

ianian99

+ is positive and
- is negative

whatch what you are doing when soldering batteries, could explode

bilbo_2

so are you saying that the 2 pins in the middle are not in use ?

I solder red to positive and black to negative and use them to charge it up with a mobile phone charger

then remove the charger and connect the item that needs the power to the same 2 pins ??



Thanks for your patience

espresso

bilbo wrote: »

so are you saying that the 2 pins in the middle are not in use ?

No they will used to monitor the charging or sense for over temperature.

I solder red to positive and black to negative and use them to charge it up with a mobile phone charger

If you just want to use the battery, connect to + & -

then remove the charger and connect the item that needs the power to the same 2 pins ??

There will be charging circuitry in the handset, which connects to the centre pins on the battery. If you want to use the battery independent of the handset, you will need a different charger to charge it.

Thanks for your patience

.......................

bilbo_2

so can i just use a nokia charger connected directly to the battery

i've just bought these batterys on there own and want to charge them up and use as a power supply

ianian99

bilbo wrote: »

so can i just use a nokia charger connected directly to the battery

I would say no to that as espresso says the phone will have circuitry to charge the battery, i you connect the charged straight to the battery you'll just be putting 3.6 v dc straight into the battery

espresso

bilbo wrote: »

so can i just use a nokia charger connected directly to the battery

i've just bought these batterys on there own and want to charge them up and use as a power supply

Lithium cells do not like being overcharged and you would not have any circuitry to control the charging. [FONT=Verdana, Arial, Helvetica, sans-serif]Overcharging causes the cell to heat up and the cell could explode.[/FONT]

payless

interested in whats iots for ? looked at this for a gizmondo, although not sure about soldering

fwor

Possibly a better solution would be to buy a "desktop charger" for that make of battery from Ebay - the really cheap ones that come from Hong Kong for about £3, and modify that to include the output that you need.

That way you don't have to solder onto the battery and don't have to worry about the sensor and overheating - though you will have a bit of extra bulk to carry around while you are using it...