If I add a Grafoil shim when replacing my Nexus 4 battery, what are the specs for the sheet?

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I need to replace the battery in my Nexus 4, and thanks to your guide, I’m sure it won’t be much trouble.

However, I have noticed the phone gets very hot, and the comments section suggest adding a Grafoil shim to distribute the heat — which sounds like a good idea. I have two questions: 1) what’s the spec of the Grafoil sheet I need, and 2) what sort of adhesive should I use?

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