[Xiaomi Mi Max 2  ROMs, Kernels, Recoveries, & Othe] jbmc83:
hey guys!

so after 16 charging cycles on MSM Xtended v9.5 with Stock and HR Kernel I think its time for a little review on battery performance and runtimes. I will compare the data that I have collected with my previous Xuefer LOS 14.1 ROM, so I hope you guys enjoy!

The collected data is based on 16 charging cycles on MSM Xtended v9.5 and 77 charging cycles on Xuefer´s LOS 14.1.

First thing ive noticed is the difference in fast charging capabilities over complete charging cycles (usually in the range of starting at 15-20 up to 100% in my case):

LOS used 1502 mA power to charge, whereas MSM charges at an average of 1214 mA.

This means going from 0 to 100% in 3h34m on LOS or 4h19m on MSM (or 45 min longer).

My opinion on this: The difference of 45 min or 20% longer is definitely bearable, especially considering that the lifetime of the battery is prolonged this way.

Moving on to SOT or Screen On Time!

LOS provided me an average of 17h34m SOT when calculated on a full charge (0-100%).

MSM so far averaged 16h05m SOT for a full charge (0-100%).

However, bear in mind that my overall battery capacity has decreased ever since i started collecting this data! So we have to base these SOT values on the corresponding battery capacity averages of their charging cycles.

LOS averaged a capacity of 5290 mAh, whereas MSM averaged 5230 mAh.

So we divide each battery capacity average by the SOT and we get the following results:

LOS costs you around 5.0 mAh / min SOT, whereas MSM is slightly higher at 5.4 mAh / min SOT.

We thus have an 8% higher SOT capacity cost on MSM than on LOS 14.1.

Two important things to consider here: LOS 14.1 was run with the CPU at full stock going from 652 Mhz to 2.0 Ghz, whereas MSM is run at 480 Mhz up to 1.4 Ghz. Funnily, at these settings MSM actually provides a more fluent subjective performance than LOS! However, this just shows you how incredibly battery efficient the Xuefer build was and still is! The downside being that youll have to deal with outdated software and minimal customization options. Plus, MSM fluidity allows to apply battery tweaks without losing too much subjective performance and thus at least coming close to Xuefer battery efficiency in terms of SOT.

Last, but not least, lets take a look at standby runtimes and resulting efficiency:

On average, LOS provided a standby (screen off) drain of 0.28 % per hour, whereas MSM only costs you 0.24 % per hour.

Thus, MSM looks to be 17% more efficient at standby mode.

But as above, lets consider this in terms of average battery capacity, since percentages are just relative and without proper context!

Again: LOS averaged 5290 mAh capacity, whereas MSM had an average capacity of 5230 mAh to work with.

Dividing the capacities by the respective calculcated total standby times we get the following:

LOS costs you approximately 0.22 mAh per min standby time, whereas MSM only uses up 0.12 mAh per min standby time.

This is a difference of almost 100%!!!!! This goes to show how much battery and efficiency optimizations have evolved due to newer Android version, custom ROM development and, likely most of all, Kernel optimization!

To make this even clearer in terms of raw standby times: LOS would allow you 16 days and 15 hours of standby, whereas MSM goes to a staggering 31 days and 10 hours!

I hope you guys enjoyed this little review from my side :)

cheers!

edit: a little addendum here concerning battery wear - So far, based on 93 charging cycles, I can state that you lose about 2.3 mAh battery charge per full cycle (100-0%). So after 93 cycles (equating to 75.66 full cycles, thus averaging 81% per cycle) ive so far lost about 173 mAh battery capacity. Since I started at 5370 mAh, ive now got 5197 mAh or 96.8% capacity left.