Released on September 19, 2014, this 4.7" screen iPhone is the smaller version of the iPhone 6 Plus.

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Is my battery at fault?

I've inherited an iPhone 6 which a friend has recently upgraded from due to "battery problems", as I was told, and I'm trying to get it back into a usable state. When not connected to power, the device remains powered off completely. When plugged into power, the device seems stuck in a boot loop. It powers on, light grey background with Apple logo for about 15 seconds, then screen switches off for a couple of seconds, then back to the first screen.

I can put it into standard Recovery mode, but attempting to Restore & Update results in an error 4013. Putting it into DFU mode and trying the same gives an error 4005 (eventually, takes a lot longer). Tried on both Mac and Windows machines, a couple of different cables, just in case, but identical results. Device has no sign of any physical damage.

Now my question is: Does this describe a situation where the battery has (effectively) died, and what are the odds that replacing the battery will give me a fully functional device?

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4013 and 4005 are NAND related issues, the memory chip on the logic board needs to be at least removed reballed then reprogrammed. All done via board-level repair / microsoldering.

It's probably going to be hard to find someone in your area that does that job as it's very tedious to do.

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That would be annoying. Curious that Apple's KB article for those errors seems to indicate that retrying with different cable/computer/etc may resolve them (but then that's Apple's answer to most things). Was really hoping a fresh battery would solve all my problems. Any idea the ballpark price I'd be paying for your suggested fix? Might be better stripping for parts.

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$120-$180 around there. Requires more work than replacing charging chip.

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