[protimewaster]

I also wonder how this is impacted by time. If I have a device that's at 75% capacity at 200 cycles, but it's 7 years old, does that fail to meet these requirements?

Because my experience has been that the cycle count doesn't matter that much as the battery gets old. Old batteries just lose capacity.

[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.