The Nexus 6 is an Android phone developed by Google and Motorola released in 2014 with a 6-inch display.

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Is it possible that it's overcharged? Which contacts to measure?

My Nexus 6 pooped out on me yesterday. The previous night it shut down randomly (Not powered down- just went black and then started back up.) and I didn't think much of it. The next morning it froze briefly and shut down just like last night, except it didn't power on. It was on the charger, but wasn't warm at all as it had been charging all night. I tried to access the fastboot (I had it enabled) but nothing, no response at all. So I had to tear it down. It was plugged in both times it shut down.

Once I had access to the battery connector, I measured it with my multimeter. The two contacts on the sides had "P+" and "P-" under them, like this:

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When I contacted my multimeter to these, it registered 4.10 volts. I know this isn't normal voltage for this battery, but shouldn't it still start up? Any chance it ruined the logic board? Upon inspection, the logic board looks perfect. At least the front side of it. The battery looks visually perfect too.

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@avanteguarde Any chance you think this is firmware related?

@theimedic @refectio is it bad for an iPhone battery to be above 3.7v? Do you think I wasn't measuring the voltage right?

I was saving up for something else more important and I don't want to buy a new phone right now, so if I can make this one last another 12 months that would be great.

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@mayer if you have contact with @theimedic, please send this to him. I don't know if anyone else can help.

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Hmm...full disclosure, I do not generally work on Nexus devices.

However, the voltage indicated on a battery is the nominal voltage, you can read up on it here. A fully charged Li-ion battery will always be higher than the nominal voltage, typically around 4.2V. So if you are measuring 4.1V (with the battery disconnected), then there doesn't appear to be anything wrong with your battery, at least from a charge perspective. There may be an issue with the gas gauge though. Trying a new or known-good battery is always a good first step...

For perspective, an iPhone battery has a nominal voltage of ~3.8V and fully charged it is ~4.2V. When the battery is below 3.5 V, that's when it shows less then 5-10% charge. Anything much lower than that, and the phone will not boot.

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Hmm, Okay. So much for the overcharged battery theory.

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overcharged theory, yeah thats gone. But that doesnt mean there isnt an issue with the battery. Like @refectio stated, be sure to try a known good battery before going any further. there could be something wrong with the built in circuit that relays battery information to the phone.

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@refectio, what is the gas gauge? Would it normally power up if it doesn't have a battery?

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Got any brainstorming ideas? How would I find which EMI shield the charge circuit is under to look if it is burnt out?

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