Data
Coolfire Z80: 80 watts from a single 18650
Coolfire Z80: 80 W advertised, one 18650 cell, USB C charging. What arithmetic says about the power actually sustainable and about runtime.
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21700 battery: reading capacity and runtime
How to read a 21700 battery listing: turning mAh into watt hours, estimating runtime by arithmetic, and reading the discharge line properly.
