why wouldn't it be compatible with other phones?

See this photo:

https://store.storeimages.cdn-apple.com/1/as-images.apple.co...

The camera bump on other models protrudes more towards the centre of the body. And thus the battery wouldn't fit (flush) and the Qi charging wouldn't engage properly.

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justinator 6 days ago | parent [-]

So running the battery perpendicular to this photo isn't an option?

I'm sorry if I'm not completely familiar with this product: you are to have this battery attached at all times while you're charging, and it just stays in place? (gawd I sound like I'm from a different planet, I apologize -- wireless charging just never has been interesting to me)

	▲	altairprime 6 days ago \| parent [-]
		Yes, the power icon on the back of the phone cases is a set of magnets designed to ensure rotation and x,y center magnetic lock.