Another approach to fix battery drain - HD2 Windows Phone 7 Development

Hi,
I've got an idea to "fix" battery drain in WP7, as well as with Android.
I can't really assure you how much it's working as I do this each time I install WP7 since the first version of MAGLDR is out.
I started doing this because I had battery problems with magldr.
Here is the trick : In fact, when you install MAGLDR, Windows Phone 7 / Android, or even update WP7, the battery is not charging but draining (that kind of procedure eats a lot of power). But even if the installation ends with a 40% charge, the OS will be sure, at first start that it's almost 100% charged.
I think it's a reason why the battery goes empty faster than with Windows Mobile. It was default OS, with default configuration etc. so 100% was 100%.
So I think we must, at least once, charge the battery outside of the phone, with a dedicated charger. In that way, when WP7 will start, it will see the fully charged battery (100%, for real).
I think the OS will know, when the battery will be discharged, the real capacity from 100 to 0.
I hope it will help, and that I'm not wrong as I don't experience any real battery drain if I do this + camera trick since first version of WP7, and with any Android rom (except MIUI).

---

Hi
My solution is close to yours.
After each flash I let drop my battery until the phone died and you can't restart it under WP7
next I start to charge it under MARGL 5 min then i start WP7 and let it charge.
Now i'm sure that the phone have a good battery calibration.
My HD2, 2 years old, and with camera trick can stay 48 hours in 3G but only 24 hours in 2G??? WTF?

---

You're not completely right here, OS would not think that change at first boot is 100% charge, you can easily check that by booting first time on half empty battery and indicator will show about 50%.
But yes, battery stats might affect battery drain, so there is a button in MAGLDR something like "Clear battery stats", reboot to MAGLDR, charge to 100%, click that button, boot back to your OS.

---

intresting therys
What is we charged up to 100% and did a hard reset would that make the probum go away?

---

vartp said:
You're not completely right here, OS would not think that change at first boot is 100% charge, you can easily check that by booting first time on half empty battery and indicator will show about 50%.
But yes, battery stats might affect battery drain, so there is a button in MAGLDR something like "Clear battery stats", reboot to MAGLDR, charge to 100%, click that button, boot back to your OS.
Click to expand...
Click to collapse
Oh ok. Weird, each time I flash WP7 or Android, it tells me that I've got something between a 100% and a 90% charge, which isn't possible, after having installed MAGLDR, then flashed the new OS and waited for the first boot (really long with Android).
Nonethless, I flashed WP 7.5 with radio 5.66, and I'm experiencing a huge battery drain, even with camera trick & external charge.
Even Miui seems to last longer. And Android tells me that I have a 62% battery charge, and I restarted the phone on WP and it tells me that I still have a 76% battery charge.
Why don't I have the same charge estimation ?

---

Nevralgeek said:
Oh ok. Weird, each time I flash WP7 or Android, it tells me that I've got something between a 100% and a 90% charge, which isn't possible, after having installed MAGLDR, then flashed the new OS and waited for the first boot (really long with Android).
Nonethless, I flashed WP 7.5 with radio 5.66, and I'm experiencing a huge battery drain, even with camera trick & external charge.
Even Miui seems to last longer. And Android tells me that I have a 62% battery charge, and I restarted the phone on WP and it tells me that I still have a 76% battery charge.
Why don't I have the same charge estimation ?
Click to expand...
Click to collapse
well I can't answer that question but I would bet android is not the 1 that is giving wrong charge estamations in on bttfv2 and I was on v1 and never experienced fast battery drain I personally like the wp7.5 over the other os's so I'm dealing with the fast battery drain issue & random reboots as well I also think the to problems are related some how the random Reboots it never happens when on on a charger! I really think someone should go back to bttfv1 to test and figure out what went wrong when new registry edits was implemented or the new rom was cooked but anyway I read DFT is also working on a new rom I'm not sure if it will be for hd2 tho.
I'm really hoping the problem can be sorted on my last phone I got about 300hrs out of 1 charge but charging touck a wile on my hd2 charging seams to be pretty quick which might not be a good thing not sure. But last night I had it on charge almost 10 hrs after it was already 100% and when I finly got it off the chager it seamed to last a little bit longer
But on rough estimate I'm thinking it last 5 hrs witch is just horrible

---

vartp said:
You're not completely right here, OS would not think that change at first boot is 100% charge, you can easily check that by booting first time on half empty battery and indicator will show about 50%.
But yes, battery stats might affect battery drain, so there is a button in MAGLDR something like "Clear battery stats", reboot to MAGLDR, charge to 100%, click that button, boot back to your OS.
Click to expand...
Click to collapse
Where is this clear battery stats button you speak of?

---

kid1988 said:
Where is this clear battery stats button you speak of?
Click to expand...
Click to collapse
Unfortunately, it's a mistake. I've never seen any "clear battery stats" menu in MAGLDR. But I think it exists on ClockWork.
It's a shame...

---

Battery life 24hrs+
All,
After reading the above posts, I started practicing the following;
* Let battery drain more than 90% or until critical battery warning appear
* Charge in full
* Power of phone. As the phone power off, power off charger ( ... this action may be insignificant)
* Boot the phone to MAGLDR
* Select "Reset" option from the menu
* Phone reboots normally
I have been doing this for the last 2 weeks I guess plus more than 8 charge cycles and now my HTC HD2 lasts 24hrs+ at any rate.
... I am not a heavy user, but still, I have OutLook, GMail, FB, Twitter running 15mins sync interval. 10+ calls + 5/6 SMSs a day in average. My good'ol battery keeps me happy.
... hope this helps someone ...

---

I found that it was my choice in SD cards that was causing battery drain. The camera trick got me down to a battery draing of -200. I couldn't understand why I couldn't get down to -7. WP7 "seemed" to be performing fine.
Switched to PNY 16GB class 4 and I think WP7 has accepted it. Have had a few reboots, but nothing I can pin on the card yet. My battery life is amazing in comparison to before. W/ wifi and bluetooth turned off, I get a battery drain between -4 and -7. MUCH better than before.

---

I can't get Battery Tool to work to check the drainage on Mango, but I found out that having 3G enabled, Push enabled (set mail check on "upon arrival") is giving me the best battery life. I'm using Mango since yesterday morning 11 am until now (it's 9.42 here) and I have 31% battery left.
Average usage (but it's enough for me) with internet, mail sync, twitter, facebook and some pictures.
for the record, I did not use the 'camera' trick at all.
When I disable push, and have email check set to 'manual' i'm starting to have drains and I have to use the camera trick to keep it low...
I know everybody has different results.. but I just wanted to share this, see if others can relate to this

---

Its pretty strange this battery drain issue, i struggled with it for months with the last wp7 rom i used.
With this rom i struggled with sd card issues like everyone else, in the end i'd bricked 4 cards of differing sizes and the onlycard i had left was the tiny 2gb sandisk that came with my HD2.
Since settling on that card i've had no issues other than storage space and battery drain is a thing of the past which could suggest that card compatability is at the heart of the problem.
Its my guess that constant attempts at read/write failure may be going unreported by wp7.
Currently im seeing about 36hrs at my regular usage, i can stretch it to 48hrs if im careful.
My wifi is on throughout my working day, i make on average 6-7 calls and send and receive 10 or more txts along with a steady stream of people hub updates.
I'm happy in the belief that i don't have a battery issue, i just wish i had more space.

---

So much for my optimistic post earlier, one reboot messed up the battery read. 40% left and 2 hours of usage .... I give up
Sent from my HD2 using XDA Windows Phone 7 App

---

... try this for a change
KrewsialNL said:
So much for my optimistic post earlier, one reboot messed up the battery read. 40% left and 2 hours of usage .... I give up
Sent from my HD2 using XDA Windows Phone 7 App
Click to expand...
Click to collapse
... why don't you try this method http://forum.xda-developers.com/showpost.php?p=18770816&postcount=9
... sometime back I too had the same problem, but that all changed!

---

if you fully charge (100%)..your phone in wp7 , it will show erroneous battery drain,...you can rectify it by restarting the phone, then use the camera trick.
if you charge till 99%.it is ok, but 100%...you need to restart

---

pakure said:
if you fully charge (100%)..your phone in wp7 , it will show erroneous battery drain,...you can rectify it by restarting the phone, then use the camera trick.
if you charge till 99%.it is ok, but 100%...you need to restart
Click to expand...
Click to collapse
I haven't had that experience. Sometimes WP7 won't allow a full charge to happen though.

---

Something weird just happened.I was having Bluetooth problems.It wouldnt turn on.I then Flashed the DEv wifi plus Eu fix cab.It fixed my bluetooth but with some added treats.My battery life has more than doubled.Used to go less than 8hrs of normal use but now i hv gone 17hrs and i have around 50 % left.I didnt do any camera trick.Has anybody experienced this?

---

Hi, could anyone give me the link to Battery tool for WP7 Mango. Thank

---

phong1892 said:
Hi, could anyone give me the link to Battery tool for WP7 Mango. Thank
Click to expand...
Click to collapse
Here you go.

---

anseio said:
Here you go.
Click to expand...
Click to collapse
Thank you, mate