Comment by jansan
6 hours ago
I think that there could be a wider screen if such formats are available. Once we have betavoltaic batteries, the entire card can be screen.
6 hours ago
I think that there could be a wider screen if such formats are available. Once we have betavoltaic batteries, the entire card can be screen.
I'm not sure beta voltaics will ever reach LiPo densities. All materials I know would be unwise to place in your wallet, or anywhere near your body.
If we are OK with a battery and a beta voltaic source, a tritium one is reasonably safe and can trickle charge the battery when the device is in deep low power mode. The battery can still be charged by the induction coil.