The spacers come in two sizes to make a AA into a C- or D-cell battery. Think of the spacers as a sumo-wrestling costume that makes the wearer look more like a helium balloon than a person.

It’s a small, cheap charger for LIR2032 and other rechargeable batteries comes in. It’s barely larger than the battery itself, and it plugs right into a USB port.

ChargeMe LIR2032 and LIR2025 coin battery charger 10:56 am May 24, 2019 By Julian Horsey ...

Sure, coin cells usually last a long time — but do you really want to buy new ones and throw the old ones out? The LiR2032 coin cell is a rechargeable lithium battery, for which you can build… ...