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LP-E17 battery cover with charge state indicator windows — image 1
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LP-E17 battery cover with charge state indicator windows

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Case for Canon LP-E17 batteries. Very heavily inspired by @TomSchoenlau's design, with a few tweaks.

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The principle of the indicator is that the corner of the battery appears in either the charged or discharged window depending on which way round you insert the battery. 

I implemented this because this keying notch feature is the only part of the battery, other than the contacts, that is asymmetric and in the same place on all versions of the battery from different manufacturers. The labels, logos, and other markings all vary at least a bit between manufacturers.

For an OEM battery, insert with the Canon logo facing the front cutout, and the "Charged" window is filled, while the "Discharged" window is empty.
Reverse the battery so the logo faces the clip, and the "Discharged" window is filled, and the "Charged" window is empty. 

This prints cleanly without supports. 

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