[unwind]

I understand and agree, but the use-case is a bit skewed since that's not even true for a bare "naked" battery or cell.

They all self-discharge [1], some chemistries more than others of course but phone batteries certainly do.

[1]: https://en.wikipedia.org/wiki/Self-discharge

[Retric]

Self discharge is easily an order of magnitude slower than the power draw of these devices while seemingly off.