No shit Sherlock?

“It will be easier for me to tell you how successful a product is once it’s already shipping”

The slogan is something like "Stop buying single-use batteries!", as though the only thing preventing the use of rechargeable batteries is the need for a charging station.

And the USB receptacle takes up volume that would otherwise be used by the battery medium itself. Resulting in lower capacity (mAh) for these batteries versus standard rechargeable batteries. That already deliver lower mAh per charge than a single-use battery does in its lifetime, at lower voltages (sometimes too low for electronics).

I know I'm an engineer, but do their customers really not get anything about, well, the insides being smaller than the outsides, and basic ideas like that?

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These might produce better (higher storage capacity/volume) batteries, and that would be wonderful.