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Uses for old, but good cell phone batteries? Answered

I have recently come into possession of several 3.7v cell phone batteries. I have toyed with the idea of using them to power a mag light type (D cell) flash light. Any ideas as to carry this out? Or just any ideas for re-purposing them?

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wtd1
wtd1

11 years ago

Charging's simple - put the battery in the phone, charge it, take the battery out of the phone and use it. Don't know why you'd build a separate charger....

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frollard
frollard

11 years ago

You need a special circuit to protect them - from overcharging and undercharging. Other than that, you can use them at their rated voltage. search (ibles or google) for li-po battery charger.