Standard rechargeable coin cells only have a capacity of 40 mAh, so you’ve got plenty of headroom at 1C. The total cost for this project was under $8 for three boards, and a BOM cost of $2 for one.

Rechargeable coin cell batteries are great for all your small projects. They look exactly like regular coin-cell batteries, but in a shocking turn of events you can recharge these little guys. They… ...

Volumetric LED candle looks the same from any angle—and looks like amazing work Re-creating a candle's multi-angle glow requires a lot of small-scale soldering.

In Insert Coin, we look at an exciting new tech project that requires funding before it can hit production. If you'd like to pitch a project, please send us a tip with "Insert Coin" as the subject ...