[UTILITY] Battery calibration tools

xp24002000 · Apr 24, 2012

not working for me

tried over and over, i reached 3201mV, popup flag appear, plug in charger cord quickly, red led confirm charging, and then after 10-15 sec of charging, phone shutdown each time, tried even turning lcd off, the same after 10-15 sec of charging with lcd off screen popup with airplane mode and sense lock screen, shutdown dialog box appear and phone automaticaly power off.

klaydze · Apr 26, 2012

theloginwithnoname said:
2. In the Learn Prep tab:
a. set your aEvolts to 3201 (type on each line: Register:0x 66 Value: a4 and press save)
b. set your stop charging current to <20mA (Register:0x 65 Value: 06 and press save)
c. if Capacity/mAh drops to near empty prior to 3201mV being reached, the app will automatically raise capacity by 200mAh so phone doesn't auto-shutdown prior to reaching 3201mV

Where can i actually set the "aEvolts" and "Stop Charging Current" under LearnPrep tab?
The only input field that i can see is the "Register: 0x" and "Value:"

"Advance Options" in the Settings is already ticked but then, there still no "aEvolts" and "Stop Charging Current" input field.

Thanks

----------------------

Darn! My phone dies before reaching 3201mV (3250mV to be exact). How do i calibrate that if that's the behaviour of my battery.

St4hli · Apr 28, 2012

klaydze said:
Where can i actually set the "aEvolts" and "Stop Charging Current" under LearnPrep tab?
The only input field that i can see is the "Register: 0x" and "Value:"

"Advance Options" in the Settings is already ticked but then, there still no "aEvolts" and "Stop Charging Current" input field.

Thanks

----------------------

Darn! My phone dies before reaching 3201mV (3250mV to be exact). How do i calibrate that if that's the behaviour of my battery.

You just have to do what's described in the brackets

Sent from my HTC Desire using XDA

Soldier-2Point0 · May 3, 2012

Hi guys, just wondering if you could make this work on the Motorola Atrix 4G. We are having problems with the battery percentage not reaching 100%. A lot of people would appreciate it.

Sent from my MB860 CM7 RC1 37p Radio

RogerPodacter · May 3, 2012

Soldier-2Point0 said:
Hi guys, just wondering if you could make this work on the Motorola Atrix 4G. We are having problems with the battery percentage not reaching 100%. A lot of people would appreciate it.

Sent from my MB860 CM7 RC1 37p Radio

I already tried to edit the atrix driver last year when I owned that phone, its just not possible unfortunately. Motorola is using some generic fuel gauge we don't know which, and they hide some of the kernel code for battery. Sorry.

Soldier-2Point0 · May 3, 2012

RogerPodacter said:
I already tried to edit the atrix driver last year when I owned that phone, its just not possible unfortunately. Motorola is using some generic fuel gauge we don't know which, and they hide some of the kernel code for battery. Sorry.

N00b question : how can I edit a /sys text file and make the change stick?

Sent from my MB860 CM7 RC1 37p Radio

RogerPodacter · May 3, 2012

Soldier-2Point0 said:
N00b question : how can I edit a /sys text file and make the change stick?

Sent from my MB860 CM7 RC1 37p Radio

Two ways I can think of. Either change in the kernel code whatever value is making it default to that value. But sometimes that value comes from the hardware that defaults upon boot, so you can't change it.

Or write a boot script or init d type script to set it manually each boot up.

It really depends on which hardware or sysfs file you're looking at.

temasek · May 3, 2012

RogerPodacter said:
Two ways I can think of. Either change in the kernel code whatever value is making it default to that value. But sometimes that value comes from the hardware that defaults upon boot, so you can't change it.

Or write a boot script or init d type script to set it manually each boot up.

It really depends on which hardware or sysfs file you're looking at.

Nice to see that father of N1 battery calibration is still active here.

ahac85 · May 15, 2012

hi just want to know im understanding this write, after battery age is dedicted we just update our FULL40 value thats it?

we leave aged capacity as 1393, or do we have to update that aswell?

hgmichna · Jun 12, 2012

Simplest method

What is the simplest method to recalibrate the phone/battery combo? Since the phones are usually already designed to recalibrate themselves, what do you have to do to trigger that procedure and let it run its course?

I see different recommendations, charge from totally empty to full with phone on, phone in airplane mode, phone off. Discharge first with phone on, restart after discharging and wait for shutdown two times, three times, hold the power button for 10 seconds, plug in the charger while the phone is shutting down, etc. Not everybody seems to know what he's talking about. Most of it is bound to be nonsense, but where is the truth?

RogerPodacter · Jun 14, 2012

hgmichna said:
What is the simplest method to recalibrate the phone/battery combo? Since the phones are usually already designed to recalibrate themselves, what do you have to do to trigger that procedure and let it run its course?

I see different recommendations, charge from totally empty to full with phone on, phone in airplane mode, phone off. Discharge first with phone on, restart after discharging and wait for shutdown two times, three times, hold the power button for 10 seconds, plug in the charger while the phone is shutting down, etc. Not everybody seems to know what he's talking about. Most of it is bound to be nonsense, but where is the truth?

This thread answered that question precisely, but only for the nexus one with its fuel gauge and battery. It all depends on the phone. Each uses a different fuel gauge chip, so you have to learn that info first. But after I studied for this project and read up on all the fuel gauges in use out there I'll give you my insight.

Basically there is nothing you can do typically. Charge then discharge, charge phone off, plug in for 8 hours, it all has zero effect. The voltage points are hard coded and nothing you do will change it or re learn or calibrate it. Its like a dumb chip, it doesn't know or care.

However this isn't always true. In the case of this thread we discovered this battery chip has a learn mode, and we had to root to enable it.

Many htc phones use similar chips so its possible you could do something similar. Depends on the model.

Most Samsung phones use the "dumber" chips and are unchangeable, nothing you do during charge will have any impact. Day 1 will act like day 300 from the battery perspective.

However the new sgs3 looks like it may use a more smart fuel gauge and could possibly have calibration functions. Root needed first of course.

That's basically it. Nothing you can do. The battery doesn't know if its day 1 brand new or a year old. That's how I use it anyway, I just plug and go. No top off charge, no full cycle first, no drain to empty, etc. None of it, cause we learned that it really makes no difference.

hgmichna · Jun 14, 2012

Thanks for the good information! Let me try to put things in perspective.

The Nexus One has a learn mode and can be calibrated, but the calibration becomes necessary only because it is already misdesigned and does not learn automatically.

Learning automatically should be almost trivial with the simple assumption that a Li-Ion battery is full around 4.1 to 4.2 V and empty around 3.2 to 3.4 V. If the phone can measure the battery current, determining the battery's capacity during a continuous empty-to-full load cycle is, indeed, trivial.

Let me ask a slightly different question: How can a normal user recalibrate his unrooted Nexus One?

Additional questions:

Does the unrooted N1 also go into learn mode as the battery goes empty? What is the best way to make sure it is in learn mode?

Why are people recommending to attach the charger quickly after the battery has gone empty? This does not seem to make sense. Is it the consequence of yet another misdesign?

theloginwithnoname · Jun 14, 2012

hgmichna said:
Let me ask a slightly different question: How can a normal user recalibrate his unrooted Nexus One?

Does the unrooted N1 also go into learn mode as the battery goes empty? What is the best way to make sure it is in learn mode?

As Rog says, it has been answered already (here).

Why are people recommending to attach the charger quickly after the battery has gone empty? This does not seem to make sense. Is it the consequence of yet another misdesign?

Couldn't tell you, only that it works but is temporary.

Good luck.

hgmichna · Jun 14, 2012

theloginwithnoname said:
As Rog says, it has been answered already (here).

That posting did not say whether the N1 would have to be rooted or not. I take it that the procedure works on unrooted Nexus One phones as well.

As to the requirement of plugging in the charger during the few seconds while the phone shuts down on its own, this does not only sound strange, it also conjures the image of thousands of N1 users worldwide, staring at their phones while holding the phone in one hand and the already connected charge cable in the other, waiting subserviently for the phone to shut down. Perhaps the person who invented this rule now has his fun while thinking about all those stupid users following his new cargo cult.

More seriously, if anybody finds that beginning to charge the phone much later, long after it has shut itself down, also leads to learn mode and works just as well, please let us all know. Or perhaps one can restart the phone much later and then wait only one minute for it to shut down again. Would that work? Or you could recharge it for just a minute, then let it go down again, which also would not take very long. I think, if any of these procedures worked, it would be a big improvement over having to put matches between your eyelids while waiting an eternity for the shutdown.

theGanymedes · Jun 15, 2012

Let me try to add up what I know here too, as a guy who fiddled with the battery driver as well

As @hgmichna told, normally the chip is supposed to calibrate the battery accordingly with the usage. However, I've seen that due to a driver bug (or actually it's not a bug but rather a "wrong assumption") the Sense battery drivers overwrite the calibration data after each charging to full level; thus making the chip useless about the calibration.

Another issue is about the phones: even though the bug is "fixed", the chip still (I really don't know why) runs on "offline" mode when the device is on but not charging. This makes the chip run on bare minimum configuration; thus not running some algorithms like "calibration algorithm". Even though it's possible with a hack to make chip run on "online mode", the effects (side or desired) are unknown yet - someone should test the effect in a long time usage and it's not me

.

Thus, making the calibration yourself seems to be most "feasible" solution that yields the results in shorter time span. After all, calibration is not that frequently needed: one calibration per year is fairly enough most of the time.

theloginwithnoname · Jun 15, 2012

theGanymedes said:
calibration is not that frequently needed: one calibration per year is fairly enough most of the time.

every 100 battery cycles ("charge to full battery") is best

remember, to keep it you need to charge the device ON - i reverted to airplane and silent modes instead of turning the device off, such was my need/wish to know my battery remaining was accurate to 0%

hgmichna · Jun 15, 2012

theloginwithnoname said:
every 100 battery cycles ("charge to full battery") is best remember, to keep it you need to charge the device ON - i reverted to airplane and silent modes instead of turning the device off, such was my need/wish to know my battery remaining was accurate to 0%

I have also successfully recalibrated my Nexus One, charging in Airplane mode, but this contradicts the very explicit advice given in the very first message of this long thread.

Has anybody successfully calibrated, while charging it powered down? I mean, run it until it shuts down on its own, plug in the charger and let it charge without restarting it?

I am also getting curious about other phones. Any knowledge there? How do they usually calibrate their battery meters?

theGanymedes · Jun 16, 2012

hgmichna said:
I have also successfully recalibrated my Nexus One, charging in Airplane mode, but this contradicts the very explicit advice given in the very first message of this long thread.

Has anybody successfully calibrated, while charging it powered down? I mean, run it until it shuts down on its own, plug in the charger and let it charge without restarting it?

I am also getting curious about other phones. Any knowledge there? How do they usually calibrate their battery meters?

I already described the steps needed in order to be able to charge off... It's a few pages behind

hgmichna · Jun 16, 2012

theGanymedes said:
I already described the steps needed in order to be able to charge off... It's a few pages behind

But wasn't it refuted a few pages later?

RogerPodacter · Jun 17, 2012

hgmichna said:
That posting did not say whether the N1 would have to be rooted or not. I take it that the procedure works on unrooted Nexus One phones as well.

As to the requirement of plugging in the charger during the few seconds while the phone shuts down on its own, this does not only sound strange, it also conjures the image of thousands of N1 users worldwide, staring at their phones while holding the phone in one hand and the already connected charge cable in the other, waiting subserviently for the phone to shut down. Perhaps the person who invented this rule now has his fun while thinking about all those stupid users following his new cargo cult.

More seriously, if anybody finds that beginning to charge the phone much later, long after it has shut itself down, also leads to learn mode and works just as well, please let us all know. Or perhaps one can restart the phone much later and then wait only one minute for it to shut down again. Would that work? Or you could recharge it for just a minute, then let it go down again, which also would not take very long. I think, if any of these procedures worked, it would be a big improvement over having to put matches between your eyelids while waiting an eternity for the shutdown.

The reason you have to plug in quickly right before empty is because that's the only time the learn flag is activated, but this is also what shuts down the OS. So you only have a few second window.

And yes non rooted could still activate this learn mode, I did it once only. Its extremely difficult. You won't know when the learn flag flips until the phone already begins shutting down. That's why I had to modify the driver. But yes you could also just leave the phone off and charge, but you won't be seeing if the learn flag is actually on. And subsequent boot up sometimes clears the status register thus wiping your learn and new age value since this chip is so fussy.

[UTILITY] Battery calibration tools

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