Weird magnetometer values

[wibble]

Mh need to investigate the effect of different battery charge levels.

I was thinking of when you swap the battery for a different one, not at different states of charge for the same battery. I noticed the stock battery was magnetic when looking at magnets as a catch for a flip cover, or as a way of holding docked things to the back. it's the first time I've noticed a phone battery being significantly magnetic, and a quick run round a few other phone batteries shows they aren't. I don't have a replacement Samsung-compatible battery to try.