while I don't think these are going to work unless they can get a 5 watt battery the same size as a phone battery, if they actually have a 50 year lifespan like

while I don't think these are going to work unless they can get a 5 watt battery the same size as a phone battery, if they actually have a 50 year lifespan like the company claims that would be WAY more than the lifespan of the device. If it actually existed you'd actually have the opposite problem. "My battery is fine but this device just isn't keeping up, can I transfer my battery to my new device?"