On 12/4/2012 7:33 AM, KenO wrote:
Have a couple of older Motorola cell phones with good 3.7V 950mAh Lithium Ion Batteries and chargers.

Would like to use these Li batteries to make a Li LED Flashlight.

Hope others have tried this and have some suggestions.

Thanks

Ken
Suggestion: forget it.
If you want a flashlight, watch bensbargians.net for a sale.
Or read the candlepower forums.
Or try dealextreme.
There are lots of very good lights cheaper than you can buy
the parts in onezies.

Do this thought experiment.
Take out the battery.
Unplug the charger.
You just disconnected all the stuff in between that keeps
the battery from catching fire when you charge it.

And someone will surely chime in here and say that the battery
has a protection circuit built into it.
And they're probably right...probably.
It's there as a secondary protection method in case the phone
charge circuit fails. You do not want to rely on it for daily
charge management.

Depending on how old, the battery may already be shot.

While it's possible to do what you want, it's not economically
feasible and the result may not fit in your pocket.
And it's very embarassing when your junk catches fire.

If you knew what you were doing, you wouldn't be here asking.

Find a hobby that's not so incendiary.