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Is there a way to precisely locate a Qi charging coil on a device? (lemmy.world)

submitted 3 weeks ago by TheFunkyMonk@lemmy.world to c/askelectronics@discuss.tchncs.de

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I have a Snap Grip Luxe on the back of my Kindle Paperwhite Signature Edition, which has wireless Qi charging but is not magnetic. On phones, the Snap Grip allows for passthrough wireless charging, so when I mounted it, I held my Kindle up to a wireless charging stand until I found the spot where it started charging, marked the top of the back with some tape, and mounted it roughly where I thought the charging coil might be (though there's some uncertainty because I don't know exactly where the charging hardware is inside my stand). It doesn't work.

It's possible this feature just doesn't work with the Kindle, but I have a new Kindle arriving soon and will have another shot at this, so I was curious if there was some way I can precisely locate and mark where the charging coil is on the back of my new Kindle to at least eliminate that factor. Any ideas?

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[–] ricecake@sh.itjust.works 4 points 3 weeks ago

Your easiest bet is to find a teardown video and pause when they have the case off.

The coil is the coil shaped bit in the black plastic on the left.

Technically, you could get one of those meters that measures the power draw of a device, hook it to a wireless charging puck and slide it around. The power draw will be higher the more closely aligned the two coils are.
Going that far is going to be really fiddly and probably not worth the trouble though.