[Nexus 10 Q&A, Help & Troubleshooting] lobstapowa:
I held onto my Nexus 10 with my original battery for what seemed like forever until about a month ago where I finally decided to get a new battery to give it a bit more juice. One thing I did notice was after swapping the battery I was short exactly one screw from when I started on the battery. Those are tiny!

At first, it looked like the new battery worked wonders and lasted longer than the original although I noticed something. Every time it got to around 23% it would abruptly shut down. After researching a bit I tried the battery calibration app AND wiping the cache partition. Didn't matter.

I backed up my data then I attempted a factory reset. Didn't matter.

Up to last night I had been using a generic fast charger cable with brick and then tried a fast charger cable connected to the original nexus 10 wall brick as the original usb cable sort of disintegrated over the years. I tried using a different usb cable from my old Samsung S3 phone but I used it with the original power brick that came with the nexus 10. Didn't matter BUT I did notice that using it that time it took forever to charge to 50% and as of now is still stuck there. I"m going to keep waiting to see if this fixes itself.

Since I had wiped my data I figured it might be a good idea to install a custom recovery like TWRP unlock the bootloader and root the phone. Went for it although I ran into issues with Busybox and not having enough storage to install. After finagling it I put it on xbin and got it working.

I'm still using the latest version of stock lollipop. I was thinking of flashing the marshmallow romon Lineage 13 to retain use of the camera for scanning things but had heard of issues with youtube and bluetooth as well as random restarts so might not. I'm going to lose the use of the camera there are probably better versions to use than Lineage 14 which was my other choice.

Right after this in addition to having the battery shut down every time I started it back up it ALWAYS optimized apps. Every time and with about 172 apps or so boot times seemed close to 45 minutes. Horrible.

I tried running the calibration app again AND manually deleting batterystats.bin as I wasn't sure if the app was actually doing it. Again nothing.

I then went into TWRP and wiped the cache and dalvik thinking that might fix the optimizing issue. I noticed after doing so it I got an unable to mount storage message constantly. A quick repair file system command stopped that but it might be indicative of something.

Then I thought well maybe the battery issue might resolve itself if I let it drain from 100% to 0 or 5 inside TWRP. It didn't shut off right at 23% but like 5 minutes from that it went to 0% then 3 minutes later it auto shut off. I feel like that's indicative of something I just don't know what.

I'm beginning to think I got a bad replacement battery. Or that the missing battery screw is rolling around somewhere inside the Nexus 10 and shorting something out maybe? That's probably not possible but I'm at a loss.

I took photos of the cables connecting to the battery and made SURE they matched exactly as they did before with the lines on the ribbons so I'm inclined to think it wasn't that.

I'm not thrilled about having to pay for another battery and take off the back of the Nexus 10 again (that was the worst part hands down) but if that's all it is I'm willing to do it.

Kind of out of ideas except trying a second new battery.

Anyone have an idea of what else to try?

Random but I'll mention the first time I booted after the root SU asked to update new binaries. As I did a second factory reset after rooting the next time it asked me I declined. Not sure if that made a difference one way or another.

I did attempt to use the optimizing apps fix app but that stuck it in a boot loop. Leading to the 2nd factory reset.