Tripling My Nexus 6P's Battery Life

[iamdarkyoshi]

I'm not a fan of today's phones and their compromise for thinness over battery life.

Of course, I could just make an external battery case, but I had a crazier idea: Remove the back cover completely, and make a new back/case combo on my 3D printer, and just connect a bigass lithium battery to the existing one. This means I could relocate the fingerprint scanner, something that has been stopping me from making a battery case. The fingerprint scanner is on the back, and would end up being covered by a battery if I were to make a non intrusive battery case.

The nexus 6p doesn't seem TOO hard to take apart (with the microsoft surface being an obscene pain in the ass) according to an ifixit teardown:
https://www.ifixit.com/Teardown/Nexus+6P+Teardown/51660

If I were to get inside the battery's outer sticker (gaining access to the battery terminals) and connect another lithium battery to it, would the phone/battery BMS re calibrate capacity? If I were to increase the phone's battery from 3.5Ah to 10Ah, would I need to make other mods?

Thoughts? Ideas?

[Rerouter]

The battery management ic is inside the battery I think.. otherwise it would get confused every time you swapped out the battery in a replaceable model.

If it's one where the battery is sealed in, it likely won't correct for it, and instead stop charging early as a protection feature.

[amyk]

Most replaceable phone batteries I've seen are just +/-/thermistor and the BMS just uses a combination of voltage and internal resistance (current) sensing.