Recycle Lumia 635 battery to use as spare for Lumia 950

My Lumia 950 phone is great and with a 3000mAh battery it lasts quite a while. But sometimes I like to carry around a spare battery. Rather than buy a spare, I had some old Lumia 635 batteries (1830mAh) which are a bit smaller and thought they might work in my 950. The electrical contacts certainly line up:

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But the notches in the plastic battery casing didn’t match:

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With a Dremel tool I cut away a bit of the plastic in about 30 seconds. No danger of rupturing the Li-ion cell since the plastic case is a few mm thick:

img_0760

So now the smaller battery fits:

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Its held in place with tape which is OK, but I plan to design and 3D-print a little case/spacer for it so it doesn’t dislodge from the electrical contacts. I’ll report back on battery life with only 1830mAh.

Happy modding!

 

 

 

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