remarkablemayonaise t1_jee2y8r wrote on March 31, 2023 at 10:36 AM

Reply to comment by whiskeysixkilo in eli5: Why do seemingly all battery powered electronics need at least 2 batteries? by OneGuyJeff

The Lithium cells are rechargeable (typically) or are very specialised single use.

The chemistry of cheap single use cells is based around 1-2V. I'm sure there is some chicken and egg problem where cheap cells could be developed with a higher voltage, but typically higher voltages involve batteries of tried and tested cheap cells.

Pocok5 t1_jefef4t wrote on March 31, 2023 at 4:44 PM

> very specialised single use.

You mean coin cells. CRxxxx coin cells are all single use Li-MnO2.

biggsteve81 t1_jegifwf wrote on March 31, 2023 at 9:09 PM

You can buy lithium AA and AAA cells from Energizer.

remarkablemayonaise t1_jeffktc wrote on March 31, 2023 at 4:51 PM

Fairly expensive in terms of energy density. The alternative are silver based. If you're using a watch for a year or two it shouldn't make much difference.