Rechargeable AAAs are crap though. Power density sucks. Voltage level sucks (and voltage regulators will suck the battery dry before your micro does). And the form factor sucks.
I'd sooner have a 18650-family (e.g. 14240 or 14500) become standard than a bunch of AAAs.
I'd sooner have a 18650-family (e.g. 14240 or 14500) become standard than a bunch of AAAs.