Had to use my old TI 89 one day. Haven't used it in 10 years. Took it out of storage, put in 4 AAA usb-c rechargable batteries, worked like a charm. Could you do the same with your hard to replace custom battery?

Any consumer electronic using standard format batteries is superior by default. Because 10 or 20 years from now, it still have brand new full batteries lying around.

▲

jamesgeck0 4 days ago | parent | next [-]

I have an early digital video camera with a genius design. It came with a custom rechargeable cell in the battery compartment. But the compartment _also_ supports regular AA batteries.

	▲	seany 4 days ago \| parent \| next [-]
		Most petzl headlamps are setup this way for a small lipo pack or 3 aaa's. It's great
	▲	globular-toast 4 days ago \| parent \| prev \| next [-]
		Brother label printers used to support this up until a couple of years ago at least but sadly the most recent models have stopped having the AA compatibility.
	▲	autoexec 4 days ago \| parent \| prev [-]
		Absolutely the best of both worlds. You can find a shop selling AA everywhere in a pinch and keeping a few in the camera bag is easy too.

▲

f1shy 4 days ago | parent | prev [-]

I‘ve done this with my HHKB. Great solution.