[arendtio]

That's another valid point: when you just keep a battery around and don't use it, it also loses capacity at a certain point.

So even when you don't use them, you have to babysit lithium-ion batteries. That's why I still love devices with those crappy AA batteries. In general, those have lower capacity, but you can just dump a device into a drawer for 3 years (remember to take the batteries out or use rechargeables) and just put fresh batteries into the device when you need it.

For example, I have those wireless Sennheiser over-ear headphones, which are probably 10+ years old, but they just keep working because they use AAA rechargeables.