Nexus 7 battery use... What's causing this weird graph?! - Android Q&A, Help & Troubleshooting

Since I installed Marshmallow I've had massive battery drain problems with my Nexus 2013 (Wifi)
I tried all the tricks on here, cache clearing, chaning wifi settings (used to show wifi as the culprit, but not any more) and finally a factory reset.
However, I still keep coming to the tablet to find it completely dead!
Here is the battery use graph from when I got to it last night:
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Looks normal at first... Slow drain, sudden drop when I watch a video, slow drain again until I watch a video the following day, but after that it slopes down to zero despite it not being used...
Anyone got any ideas? It's really driving me insane!

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For some reason, every night when my MB860 is plugged into the charger, the tegra_spi.1 system process goes nuts with CPU usage. With a name like "tegra" I assume it has something to do with the GPU, but a quick google and forum search gave me no answers other than a few people with a Photon having a similar problem, but no one seems to know why. I have no live wallpaper, or any other apps/widgets running that I can think would be using the GPU. Very strange that it only goes nuts when I'm not using the phone.
It isn't terribly important, because it only seems to happen when the phone is charging, so I'm not worried about battery drain. But I am worried about wear and tear; my experience with PCs is that the more you use a component, the shorter its lifespan will be.
Here's a couple screenshots from System Panel:
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Anyone know what might be causing this? I am running the latest October build of mmontuori's MROM on an Atrix MB860.

New Google Search causing wakelocks?

I have 3 apps to track battery usage. Crpalmers kernels have always yielded above average battery life so I don't review the apps very often until recently. I use better battery stats, battery stats plus and and the stock HTC power menu. I find the apps on both BBS and bsp are sometimes completely different for what's using the battery but usually they are similar. I know how to figure if wakelocks are plaguing the device and I think I see proof of that here in the screenshot. The battery drain issue seems to be GPS so I'm turning it off completely now. This all started after the most recent Google search update. Can anyone confirm or deny my statements, I'm not an expert but eager to learn more about how the device tends to misbehave.
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Experiencing severe battery problems for the last 2 days. Cananyone diagnose? CM 10.2

So for the last two days I've been experiencing rapid battery loss. I'll post pictures of both my system specs and my battery drain. It claims that it's the Android System. I feel like it's a program that's constantly running or something. Can anyone help? Have any similar issues? Thanks. Also, the battery would normally last for like, 15-17 hours EASILY with 20-30% to spare.
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Use WakeLock detector and try to detect, which part of your System is draining your Battery so hard. In my case, the AudioOut_2 is not disabling correctly in some cases, causing little higher Battery drain. But you will find another bug related with CM.
Just downloaded. I shall use it and check it out. Oddly enough, the battery problem only happens every few days...

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Hello guys. I have had this problem with MK6 ROM and it was the main reason that made me change to NeatRom(which I don't regret).
But lately it has returned and I have no idea why, but my phone is reporting insanely huge CPU wakelocks mainly from a process called AlarmManager (I don't know if it has something to do with the clock but last week my alarm didn't work and I would have lost my time to job if it wasn't my mother).
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Please, any help is welcome
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Pace Sudden Battery Drain

Overnight my Pace dropped from 50% to zero. The battery is normally fine & it seems to be ok now but what could cause such a sudden drop ?
was it in direct liquid contact? showers ? pool?
No & it's seems ok now. It was a sudden overnight drop which is strange as usually, with the watch on DND, it hardly drops at all. I wonder if the screen stayed on ?
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I spoke too soon. It's discharging faster than before the sudden drop.
Edit: Tried airplane mode & luckily it's clearly a software problem
I think I found it. I just looked at the watch & there was a custom Amazmod notification from half an hour ago still on the screen. The battery graph verifies it.

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