3 ms·
All of those TOTP credit cards do have batteries in them. Some of these cards use LCDs and some use e-paper. Battery life is specced for 3-5 years mostly. The
by runjake 5y ago
All of those TOTP credit cards do have batteries in them. Some of these cards use LCDs and some use e-paper.
Battery life is specced for 3-5 years mostly.
The scale is also using some sort of internal battery. It could be a gel type battery or a CR2032 or similar inside. My CR2032 powered scale is going on 12 years with the original battery.
TL;DR: there’s batteries inside.
- infotogivenm 5y agoThis. They’ll run out for sure, after a certain number of presses.
- PopAlongKid 5y agoI guess that must be it. The scale certainly has a plastic box component that could house a battery, but it does not appear to be user-accessible. I guess I have to abandon my whacky theory that somehow the kinetic energy transferred every time I step on and off the scale was being converted into a tiny amount of electricity by some kind of internal generator.