I’ve had several rechargeable lithium battery devices quit on me. Not to mention tool batteries.

Also as I mentioned in another post running a device with a dead battery via another external battery draws a LOT of power.

I don’t like the idea of an internal battery. There are lots of inexpensive, good, power packs out there that are easy to use, easy to recharge, the charge lasts a long time for a device like a chrono, and readily replaceable.

Casey

Not being married to any particular political party sure makes it a lot easier to look at the world more objectively...
Having said that, MAGA.