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Uses for old, but good cell phone batteries?
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?
Discussions
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....
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.