Question about Meta Quest 2 Elite Strap with Battery

On a PC with a link cable, the Quest charges easily or drops a maximum of 5-10% per hour, so that's easily enough without an extra battery. Also, the Elite strap battery cannot be used at the same time as a Link cable, so it's no use there.
If you're running PC-VR wirelessly, the battery would help again, but you can also use any powerbank and either attach it to the back of the strap yourself (with Velcro or 3d-printed adapters) or just put it in your pocket. Another advantage is that you have unlimited runtime with one or more powerbanks.

Still to add: I'll probably use it mostly on the PC.