[LeEco Le 2 ROMs, Kernels, Recoveries, & Other Deve] twistyplain:
My battery would randomly show almost 30% less power after a simple reboot. I am sure my battery is in perfect health because the device is just over a month old. The logical conclusion is that it's a rom issue. Maybe a calibration issue or a random failure to follow battery level across reboots.

---------- Post added at 07:09 PM ---------- Previous post was at 06:30 PM ----------

A day is more than enough if you know what you're looking for. I couldn't test things that require more time like battery backup and connection stability of Bluetooth, Wi-Fi, and hotspot.

In Pixel Experience I had an issue with standby drain but I can't fault it because I didn't use it long enough for a conclusive result. (A new rom takes some time to level out it's standby power consumption). This Pixel Experience is a port of pie from Huawei p20 pro which uses 10nm Fab for its SoC. (I doubt Huawei paid too much attention to standby drain because the SoC is damn efficient by design. In contrast, our phone has 28nm SoC that uses a lot of power even when doing nothing.

I was bummed out that the latest versions of better battery stats and GSam battery monitor are both incompatible with pie. Without those two it's hard to know what's eating your battery.

Finally, the stock smallEUI camera is fast and takes decent videos. I don't recommend it for photography because its noise reduction removes too much detail. Photos taken with the smallEUI camera look flat and lack texture. I only use default smallEUI camera for videos, slow-mo, HDR, and night mode.

I always prefer Snap camera which can be had free of charge. It takes very good still photos. Don't use Snap for videos because it stutters and lacks consistency. To use it well do NOT enable camera 2 API.

I've been trying out filmic but it's a paid app so that's irrelevant here.

As for your 2:30 battery life, your battery is showing it's age. I remember you told me it's more than 1.5 years old so Don't expect to hit over 8 hours SoT like me. My phone is barely 2 months old. Just optimize as best as you can and don't push your phone too hard if you will be away from a charging point. You can buy a replacement battery for $8 if you're not ready to part with the phone. Remember that with a two year-old battery, a process that consumes about 10% power for you would consume far less on my new battery. Maybe even less than half depending on how you have taken care of your battery.

---------- Post added at 07:11 PM ---------- Previous post was at 07:09 PM ----------

I noticed this as well. I was wondering why the phone kept playing the charging tone but I noticed it was disconnecting many times. It eventually started charging well without me doing anything to it. Fast charging is very fast on Pixel Experience. I recommend that you place the phone on a metal surface to dissipate the excess heat. I don't trust Pixel Experience thermal management very much.

---------- Post added at 07:19 PM ---------- Previous post was at 07:11 PM ----------

I wonder how your Antutu scored so high whereas mine only did 67k after a reboot and no background apps. What did you do differently?

Screen on time sounds about right, what about standby drain?

This ROM gets quite hot if you push it. Maybe improper thermal configuration?