yashsingh1/xdaforums huggingface dataset:
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] coolkaas:
usually not need to post devel kernels for all here, because it may be unstable.

really! thanx. but I can's see freqs lower than 576 mhz.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] funiewski:
not miui tpoic but bcs kernel published here...

flashed latest miuikernel, working without problems
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
have to flash back to 7.5.4, looks like it drains battery much faster. consumes 6% of battery

in less than 30 mjnutes while listening to music using poweramp.

Sent from my gorgeous ray
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
Well you should try to undervolt first rather than reverting back. If left idle, the percentage on battery is not dropping for about an hour in my phone. My voltage is set to 1.275 volt@1.6ghz
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
thanks for the tip. may i ask what app you are using for undervolting?

EDIT: i use antutu now. can you share your undervolt settings? what I/O scheduler do you use?
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] KristianKenneth:
I am using setCPU but there is other tab appeared for undervolting.

EDIT: I have to purchase antutu CPU Master Pro and indeed there is voltage tab. But I can not set TIMED profile with Antutu because in SetCPU I can set my phone to have max 122ghz only with powersave governor between 2am to 6am.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
I'm using antutu too. I just undervolt the top 2 frequency to 1.275v and the next two to 1.250v. Well, so far so good. No changes in anything else.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] varignet:
quick question is the bootpe7 kernel the newer version of boot_uv7.5.4 in regards to being used with REPACK4PDA_V7? I'm asking because the naming convention has changed :)

L
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
bootpe7 is the latest one, and you can change the voltage and got some extra RAM
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] pepbcn:
Aire and coolkaas, any plan to release a new kernel for FXP???

Thanks :)
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] funiewski:
Maybe I have found some kind of bug with the new miui kernel.

I use xCharge for rebooting device in different modes. There are two possible bugs.

Reboot to recovery did not work properly, device is booting to recovery but after a long time and some looping. The second one is rebooting to fastboot mode, it is working properly but when I want reboot the device with command fastboot reboot the device is going in to recovery instead of rebooting.

When I use fastboot in adb (not first rebooting in to fastboot with xCharge) the device is not rebooting at all after reboot command, the result of command is power off. xCharge was working properly with the earlier version of miui kernel.

Another problem is that setCPU nor cpumaster works properly, there are different problems with those applications but both worked on previous kernel, going back to earlier version.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
experienced some reboots when playing some games and my ray becomes hot (not undervolted and frequency set to 1Ghz). have to flash back to 7.4.4, the most stable one for me.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] sirkay:
@aire i feel like bootuvmiui-rel1.img better than rel3.img .. batt drain faster than rel1.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] KristianKenneth:
set values for undervolt reset to default values every reboot even though set in boot is checked. do you think this feature is properly implemented?

and yes I experienced reboot like 3 times today just using the camera alone.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
Yeah CPU Master Pro still has a bug about that. workaround is to use setXperia app (uninstall CPU Master Pro first) my phone got reboot when i set the voltage at 1.25v for 1.6Ghz. i add it to the 1.275 and it's stable now.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] longu:
The new bootpe7.img is very nice. Battery life is amazing so far! 11h and only 7% (2G, data transfer off, no BT/Wifi, few calls and SMS, some games).

Regards.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] geekoo:
How do I flash the kernel over an existing MIUI? Should I do some wipes as well? Or should I just flash the new kernel via fastboot?
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
just flash it.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] geekoo:
Tried the 1.6ghz kernel of aire. No significant benchmark improvements as compared to the 1.4ghz one. In fact, in some benchmarks, the 1.4 was faster. So was it really worthwhile to push the CPU without much benefits?
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
In antutu the score is quite improved. :-) and do have in mind that some benchmark is not up to date so you can't rely on one score only.

@aire: are the given vdd_levels optimally undervolted? Or are those just a safe values to guarantee working clock speed? I have been searching for snapdragon white paper to know the specs and voltage but to no avail. Thanks for any info.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] EL_BELLACO:
Were is the new kernel??
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] d4n3sz:
Sorry, I don't know, what is the problem,

pls help!

I used the bootpe.img kernel. I flashed it to my ray. After this a went to the recovery and I applied the zipped ROM and gapps and rebooted the phone.

After the reboot I see only the Sony Ericsson logo, and the phone doesn't boot forward.

What did I do wrong?

(I have .42 firmware with .62 baseband)

Thank you!

---------- Post added at 09:38 PM ---------- Previous post was at 09:19 PM ----------

I solved the problem. I was able to go to the recovery, I maked factory reset, I applied again the zipped ROM, and it's working ;)
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] coolkaas:
our ImmortAlex has finded that SetXperia application is good for under-volting and we all tests in what lower voltages our cpu works :-)

current voltages at last kernel is directly from DoomLords' config, it not under-volted yet.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
Ok then.. I'll try to undervolt too. Just info, at 1.6ghz it's only stable at 1.275 i guess. 1.250 give me reboot at random time. I wonder how much needed for freq between 1ghz to 1.4ghz.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] freddyngch:
Omg guysss, i accidentally flash the v7 rom and the custom pack because i thought

it would work with the stock kernel :(:( and i also flashed the baseband .64 (ntg

happen here and i still can use my phone after flashing this

baseband). Now my phone just cant boot after flashing that rom and now the phone is stuck with the

sony ericsson logo when booting, and i cant get into the CWM... :mad::mad::mad:

What should i do??! helpppp. i am a newbie in these development stuff :(

thxx in advance.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
Try to flash stock rom using flash tool. Or if you unlocked your bootloader using testpoint method, try to repair it using pc companion or Sony Ericsson update service.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] d4n3sz:
Is there anyone here who has problem with mobile data connection?

(I have .64 baseband and .58 repacked firmware)

Yesterday I wanted to use the mobile data apn and the mms apn of my mobile operator. (Telenor Hungary)

First I was able to use the mobile data. It worked fine, but I couldn't send MMS.

Today I removed all APN settings, and I added those again. Now I can send MMS, but the mobile data not working.

In the past with the .42 stock firmware everything was fine.

Any idea?
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] geekoo:
Could someone please re-up the latest version (7) of Rom and Kernel? The links don't work anymore since megaupload has been taken down.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] KristianKenneth:
Will it be harmful if I use SetXperia and setCPU at the same time, cause there are features in SetCPU that is missing in SetXperia
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] snoory:
Hi Guss,

I'm running your uv5 kernel on stock .62 Rom. Everything's working well except the fm radio. Any idea?
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
As long as the fature you use does not cross each other function, i think that's okay. But i don't recommend it. What feature do you use in setcpu btw? From what i have seen, almost all basic requirement is found in setxperia too.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] KristianKenneth:
Features like timed profile and info about time in state.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
Well no problem i guess. Let the setXperia handles the voltage, and let setCPU take care of the frequency. All is fine (except memory i guess :p)
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
Aire/coolkaas, does the bootpe.img support init.d? If it does not, if we install it by another mod in form of flashable cwm, is it guaranteed to be stable with this kernel? Thanks.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] coolkaas:
init.d support absent at pe7. I don't know what happens if you flash 3rd party replacements. as I know aire has planned to embed it support in future.

for temporary workaround you can use /system/etc/hw_config.sh :)

(4pda site is temporary die :) and I don't know nothing about current state of our modding affairs)..
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] KristianKenneth:
what are the suggested undervolting values?
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
Check pm bro. But AFAIK, it is not suitable for all ray. You must fine tweak the voltage your self.

@coolkaas, thanks for the info. :)
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
I use setxperia for under bolting and use -50 for all frequencies and is working fine for me. So far I haven't experience reboot or any problem with that setting.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] ImmortAlex:
-50 only?! Use the Force, Luke! :D

My current undervolting values:

freq orig uv diff

134 => 900 - 550 = 350
249 => 900 - 550 = 350
364 => 900 - 550 = 350
460 => 950 - 825 = 125
576 => 1000 - 850 = 150
652 => 1050 - 850 = 200
768 => 1050 - 1050 = 0 !!!
806 => 1100 - 925 = 175
921 => 1150 - 925 = 225
1017 => 1200 - 925 = 275
1113 => 1200 - 975 = 225
1209 => 1200 - 1025 = 175
1305 => 1250 - 1050 = 200
1401 => 1250 - 1100 = 150
1516 => 1300 - 1175 = 125
1612 => 1300 - 1225 = 75

I have strange problem with 768MHz. I can't undervolt it at all. While StabilityTest is passed on -200, my Ray can reboot in any time, if I change voltage on this frequency.

Also, first three freq's can be undervolted even lower, but I'm afraid of stability.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
im already experiencing reboots in -100. :( maybe its in 768 that causes reboots to mine. i will try your settings too.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
My phone won't do 1.4Ghz with voltage of 1100mv.. :( It just crashed right after that. And i am running to max 1.4Ghz@1.2v only for now. because 1.6Ghz needs 1.3v otherwise get reboot at random time. oh well..

Anyway, i'm using firmware 62 and baseband 64. In idle, the phone lost 1% of battery for every 1.5hour or so. But the case is, if i go with HSDPA/Wifi, the battery lost power quickly, like 15-20% in 1 hour. Is this normal? while browsing, my brightness is set to 15%-25%.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
15-20% while browsing?
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
Yes while browsing.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] ImmortAlex:
Do not try my settings, search for your own. Each chip has individual quality, and available undervolting depends on this quality.

On 4pda forum (before it's down) someone writes that he can do -150mV on 1.6GHz, while my chip allows only -75mV.

Also, definitely do not lower voltage equally for all frequencies. Look at my settings - there's no even smooth curve!
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] coolkaas:
hansip87,

just for example. when I browsing at every evening by opera mini I set freq to 365 mhz and brightness to 0-20%, and 2G. this usually enough for me. at this settings phone use 1% per 6.6-7 minutes, and full extrapolation 6.6min% * 100% / 60min == 11 hours non-interrupt browsing. I think this enough :)

so if my lowest settings use about 9% per hour, when your use 3G or wifi, it spending about 15-20 percents is occurred.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] bungakobis:
Cannot 'reboot to recovery' anymore..

Can someone answer me..

Since using the latest boot.img by Aire, my battery has been running nice with loosing only about 1% every hour..

My problem is, I cannot 'reboot to recovery' from Toolbox Pro or any other reboot applications.It will crash...

The only way I can do is to reboot it normally and press the - volume key as usual..

Thanks for any help..

BK:o
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
So i guess it's normal then.. :-/ thanks for the info. if it's set to 365 Mhz for browsing, wouldn't it be too sluggish with the rendering? Well, i'll try it though, thanks for the tip. :)
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] bungakobis:
ImmortAlex !

I can undervolt 768 freq. up to 975mV without problems..but the top 3 freq, I can only lowered it to 750mV..

Here's mine..

134 => 750

249 => 750

364 => 750

460 => 825

576 => 850

652 => 850

768 => 975

806 => 925

921 => 925

1017 => 925

1113 => 975

1209 => 1025

1305 => 1050

1401 => 1100

1516 => 1175

1612 => 1225
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] maxitsai:
Appreciate your work, coolkaas. I love this "slimmer" stock rom, yet I was wondering how do I select input language as "Traditional Chinese"? From time to time, I will have to text message in Chinese. Was that input method/language removed as well? How may I retrieve it back?
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
Restore the Chinese Input Method from stock ROM then. I think it's got cut by aire to achieve slimmer ROM.

Download from here
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] guap:
can I use this kernel with cm7? I like cm7 customizations but I have poor battery life with FXP kernel and your sounds promising ;)
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] coolkaas:
this is not my work :) this rom cutted (and kernel developed) by aire.

Try to install this file chinesetextinput.apk

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

Search for a kernel for CM-specific at pages above. Main kernel is for stock only but aire has made kernels for miui and cm too.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
im currently conducting stability test. does anyone have guide on how to use this? how many core and ram runs does it need to complete before i can move to the next frequency? will it automatically stop stating that my current setting is stable?
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] guap:
thank you, I installed the boot_uvfxp103 on page 13 and works, let's see about battery drain ;)

where can I eventually find new kernels from aire for cm7 in the future? will you post them here? I didn't find any other thread by aire
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
From my experience, the stability test wont give you any error. The undervolting fails more often because of transition from low to high freq.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
thanks. if that's the case then on demand governor is better than smartass?

Update: yey, i think im stable at 550 for 134 to 364.

---------- Post added at 04:47 PM ---------- Previous post was at 04:29 PM ----------

how long have you been running your ray with this settings?

@all, is there any risk to our phones when undervolted, something like burned chips?
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] KristianKenneth:
I think there will be no more update on CM7 by aire since he lost his interest in CM7. That is why MIUI and STOCK ROM are the ones updated here
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] coolkaas:
usually all gifts created by aire puts here. in current posts.

guys, aire has finded that current kernel settings is limits voltage to 625 mV :D not less! lower values doesn't matter at now. note this..
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] pepbcn:
But the "Scaling Stability Test" changes continuously freq's, didn't it???

I use it for 15 min's period, when it crashes I rise the changed voltages at previous values. Maybe more slow method, but I thing is a correct way, isn't it??

Thanks.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
what will happen if we set it to something like 550? :confused:
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] ImmortAlex:
So my conclusions is...

1. My problems with 768MHz is only my problems. It's still strange but I can live with that :)

2. Looks like aire was right when NOT released pre-undervolted kernel. We have very different non-correlating results.

3. Undervolting can't burn your phone, rather the opposite things can happen. Be ready to get nice russian winter frost inside your phone* :D

4. Setting voltage lower than 625 for lowest freq's has no effect. Vcc driver set it to 625 anyway.

5. Looks like StabilityTest does not necessarily determine instability with "Classic" and "CPU+GPU" tests. But once again, it depends on your phone. For my phone it works very well except that f**kin 768MHz. Even more: most time phone hangs and reboots before I even start the test! Now with final voltage table that I posted here my Ray works perfectly for two day.

6. The very good test is shipped with you phone: default web browser! Open some heavy site with a lot of graphics and flash ads, scroll it, zoom, read, and all of frequences will be tested.

*It's about -35 deg. Celsus outside my window right now. Looks like I need to overvolt and overclock my Ray, start some heavy 3D game and put phone under my blanket...
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
1. My problem started with 806, i cant set it to less than 1000mv. :(

4. what is vcc? voltage control? that means even if i set it to 550, the value is actually 625? btw, im using setxperia. because set control doesn't set the I/O scheduler to noop everytime i reboot my phone.

6. what i did to mine is i use system panel lite so that i can monitor the frequencies going up and down, everytime the cpu bar goes at lower value, i will scroll the list of running apps making the frequency bar goes up again. ^_^

i think i got a stable underclock settings now, i can now enjoy listening to music using poweramp without much worrying about the battery usage.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] Ridho1:
Guys, why whenever i push stabilitytest the screen goes to android market?

I don't install gapps.

Thanks.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
Because stability test is separate app from setxperia, you need to download and install it from the market.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] KristianKenneth:
Can you post your settings
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] ImmortAlex:
It's not a problem, actually. Someone more lucky, someone not. There are guys who can overclock up to 2.0GHz, but others can't even go up to 1.6 due to the same reason: chips are different in quality.

Vcc is a common name of power line in electric circuit schemes.

Yes, if you set anything below 625, driver will set it to 625 anyway.

BTW, my phone start to reboot this morning, so I set three lower freqs to 750mV voltage. Tests continues.

I'm using Cool Tool for the same monitoring.

Actually, PowerAMP is not very power consuming app. AFAIR it works on about 576MHz playing MP3@320kbps. But yeah, when you're in long jorney far away from electric wires...
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
im having a problem now. I think I have to flash my rom again. After under volting, my ray become laggish when playing games. I tried to restore the voltages to default but still have the problem.i tried to flash under volted kernel but no success. I hope it's not a hardware issue.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] hansip87:
What governor do you use when playing game? Well please report if it's better after reflashing. In fact, try to use seus for clean install and bench the game again.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
i used smartass, ondemand and performance. i think its because of the stability test i have done yesterday. yup, i will use seus. will report if it fixed the problem.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] ImmortAlex:
When SetXperia starts StabilityTest, it limits upper frequency to the value you want to test. When you stop the test, StabilityTest doesn't return upper frequency to default. I think, it's a bug, but it's not a problem to set frequencies back using SetXperia again.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] kizsleg:
it's okay now after flashing thru seus. i think i will not run stability test again since its not that effective in undervolting. i think it affected the GPU because my cpu is normal, there's no lag except when playing games.

Guys, what maxcpuload can you recommend using setxperia?
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] xperia ray:
I would like to use stock kernel with it
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] varignet:
Hi,

Still having issues with the battery,vwiped the stats, discharged and fully recharged and still the battery only shows 98%. If i charge it after aving turned it on,it then reaches 100%.

Tried recalibrating, discharged and fully recharged still only 98%. If i charge it after turning it on once it then reaches 100%.

Any thought? Thanks

Luca
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] ninunair:
Aire, why video calling is not working in gtalk? i cant make voice call too (in gtalk)
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] Bazonga:
I just found out that ALS is already included in this ROM? I modded it manually in my previous stock .42 firmware, but that couldn't still be there after flashing Aire's ROM right?
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] miedy12:
Guys can i just install only kernel because ive freshly unlock boatloader and already rooted my phone with .62 hmm can i just flash only the kernel and how? also how can i access the CMW recovery
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] Bazonga:
- Download the fastboot package and install the drivers

- Download the .img kernel file and put it in the same folder as fastboot.exe

- Turn off your Ray, hold vol + and connect the USB cable

- Still in the same folder: shift + left click and "open command prompt here"

- fastboot flash boot nameofthefile.img (eg bootpe7.img)

CWM comes with the kernel and you can acces it by pressing the home button several times as soon as the "Sony Ericsson" text shows up.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] jjdoctor:
You can flash kernel by downloading flashtool from sticky threads.
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] miedy12:
ahmmmm guys can i just flash the kernel in recovery mode? well at least thats im using in my past android device
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] AK Ben:
Why all talk about battery drain? You cant drive porsche with the consumption of an käfer.

Buy an extra accu
[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] Ridho1:
Agree. I was made afraid bout battery drain. But not anymore. Battery drain is a smartphone part, and i am so proud of it. Lol.