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• How do laptop battery voltages affect runtime?

  - by Bigbio2002

  I ordered a new battery for my faithful XPS M1710. I'm not sure of the voltage of the battery I have now, but the new one that the Dell rep got me (after 3-4 times confirming my phone number and laptop model number) is 14.8v. I was a bit concerned about potential incompatibilities (as most of the other compatible batteries listed were 11.1v), but I figure that there's no way that Dell would "recommend" batteries that wouldn't work or fry your system. Now, my question is, how does voltage affect battery life? If we assume the needed power draw to be constant, a higher voltage would indicate less amperage needed, therefore the battery would last longer before running out, yes? Or am I missing something? For reference: P=I*V P = power I = current V = voltage (duh)

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• Battery won't charge and BSOD: DRIVER_POWER_STATE_FAILURE

  - by JamesGecko

  I have a Dell Vostro 1510 running Windows 7. Today when I pulled my machine out of it's bag and plugged it in, the little battery light on the side blinked constantly instead of staying solid, and Windows showed a message that the battery was not charging. The battery is 3.5 years old, but it can still hold the machine in standby overnight, so I don't know why it won't charge anymore. After I have had the machine on for a while (20 minutes the first time, 40 minutes the second time), it shows a blue screen of death with the message DRIVER_POWER_STATE_FAILURE and reboots. I can deal with the battery being dead, but not with blue screens of death. Does anyone know how to fix it? Edit: Potentially relevant, this started happening after an OS update was automatically installed on Friday and Windows started nagging to reboot. The first BSOD was before the reboot; the update made a lot of registry changes when the machine came up, and the second BSOD was 40 minutes later.

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• Laptop Battery Diagnostics Software?

  - by Wesley

  My Compaq CQ50-215CA laptop with Windows 7 Ultimate RC 32-bit recently told me to replace my battery for fear of sudden shutdowns. Is there any good diagnostics software that anyone has used to test for battery condition and max. life? Also what are good practices for keeping maximal battery life? Thanks.

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• Clock battery broken on Solaris - how to workaround until I can fix the battery

  - by weismat

  My main Solaris server has an issue with its battery and thus I loose around 20 seconds per day. Currently I am using rdate once in the morning to synchronise the time. Which approach should I use until I can change the battery on a weekend? Should I switch from rdate to ntp? The machine runs plenty of cronjobs and thus I need to ensure that everything is started even when the time is changed.

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• How to improve battery life on Samsung 13.3” Series 7 Ultra (NP730U3E-S01AU)?

  - by beam022

  Recently I've bought a Series 7 Ultra Samsung ultrabook and decided to change the OS from originally installed Windows 8 to Ubuntu 14.04LTS. However, it's difficult not to notice great decrease in battery life: on pre-installed Windows 8 battery would last for about 6 hours while on Ubuntu it's almost empty after 2 hours of same kind of work (wi-fi, web, vlc, spotify, intellij idea). I'm not here to say that Ubuntu's battery performance is worse than Windows, but to ask for suggestions how to improve the situation (2 hours of work is pretty poor battery life). Can you recommend some sources, applications or tips/tricks that would improve battery life on my ultrabook? I really like the Ubuntu experience, but this makes my machine much less reliable. I suspect that graphic video card might be one of the issues here. Let me give you tech specs of the ultrabook: Processor: Intel® Core™ i5 Processor 3337U (1.80GHz, 3MB L3 Cache) Chipset: Intel HM76 Graphic: AMD Radeon™ HD 8570M Graphics with 1GB gDDR3 Graphic Memory (PowerExpress) and Intel(R) HD Graphics 4000 Display: 13.3" SuperBright+ 350nit FHD LED Display (1920 x 1080), Anti-Reflective Memory: 10GB DDR3 System Memory at 1,600MHz Hard-drive: 128GB Solid-state Drive More informations here, on the official page. If it's helpful to provide additional info, I'm happy to do it, just let me know what you need. Thank you.

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• How to set Fn+F2 to show battery's status throug OSD and not power statistics?

  - by papukaija

  In natty pressing Fn+F2 on my Samsung NC10 opened a new notification with the remaining battery power. After upgrading to Oneiric, it opens the power statistics. Is the a way to revert this change? Checking the battery status with the notification is much faster than finding it from the power statistics. I know that the remaining battery time can be set to be shown on the panel but I'm used to Fn+F2.

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• Reviving a dead laptop battery

  - by Alex Ciminian

  Is there any way to revive a dead laptop battery? I have a three year old Dell Latitude laptop that I've been using pretty intensively. After a year or so, the battery dropped dead - if I plug the laptop out it goes into hibernation in a matter of seconds. Probably this was because I kept working on it plugged in all the time, but back then I didn't realize what effect it could have (this was my first laptop). Currently, I'm searching for a new laptop and I was thinking if there was something I could do to get the battery back working. I've found several links (sorry, I'm a new user so I can't post them) about freezing Li-ion batteries, but the opinions seem to mixed - some say that it worked for them, some not. If you've tried the freezing technique please let me know if it works. Or if you know another way to make a dead battery work again, please share here. I've already seen this thread, but I'm not very handy with soldering. If it's the only alternative I'll try it, but there's a big chance that I'll screw it up. Thanks!

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• How to calibrate ASUS k52f battery on Ubuntu?

  - by cutalion

  I'm not sure if the problem is in software or my battery is dying, I'll move my question to another forum if it's not a SO question I have a problem with the battery on my laptop - ASUS K52F. It shows incorrect information about capacity. When I unplug the charger it can work some time, but then it will power off without any warnings. Sometimes it will power off right after I unplug the charger. Here is some info I could get: > uname -a Linux alligator 3.5.0-18-generic #29-Ubuntu SMP Fri Oct 19 10:26:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux > acpi -i Battery 0: Charging, 99%, 18:25:15 until charged Battery 0: design capacity 5235 mAh, last full capacity 69964 mAh = 100% > cat /sys/class/power_supply/BAT0/uevent POWER_SUPPLY_NAME=BAT0 POWER_SUPPLY_STATUS=Charging POWER_SUPPLY_PRESENT=1 POWER_SUPPLY_TECHNOLOGY=Li-ion POWER_SUPPLY_CYCLE_COUNT=0 POWER_SUPPLY_VOLTAGE_MIN_DESIGN=10800000 POWER_SUPPLY_VOLTAGE_NOW=9246000 POWER_SUPPLY_POWER_NOW=176000 POWER_SUPPLY_ENERGY_FULL_DESIGN=**48400000** POWER_SUPPLY_ENERGY_FULL=**646822000** POWER_SUPPLY_ENERGY_NOW=**643588000** POWER_SUPPLY_MODEL_NAME=K52F-44 POWER_SUPPLY_MANUFACTURER=ASUSTek POWER_SUPPLY_SERIAL_NUMBER= I noticed, that POWER_SUPPLY_ENERGY_NOW and POWER_SUPPLY_ENERGY_FULL are greater than POWER_SUPPLY_ENERGY_FULL_DESIGN. I don't think it's ok :) I can run any additional commands.

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• How to detect APC UPS battery usage and run a script when on battery

  - by Andy Arismendi

  I have a couple APC UPS - Smart-UPS RT 6000 RM XL Smart-UPS RT 5000 RM XL Unfortunately the power in my office likes to go out (out of my control) and hence the equipment powered by these UPS shuts down. They power a VMware infrastructure environment (VMware Lab Manager) and what I'd like to do is detect when one is on battery (say has been for x amount of time or has x percentage left) and run a script on this event. What software do I need to detect a on-battery event and have it run a script? Thanks!

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• Charging a laptop battery, without a laptop.

  - by Crippledsmurf

  I have an old-ish laptop that only works on AC power because the battery is old and no longer holds a charge. I live in Christchurch New Zealand where there has recently been a number of very large earthquakes. During one of these earthquakes my laptop was thrown from my desk to the floor and now does not respond at all when the AC adapter is connected. Given that the laptop is not responding to power, is there another way I could charge a replacement battery for it as I don't currently have funds to repair the AC adapter on the box. My research would suggest that this isn't possible as chargers need to take into account the specifics of the model of battery being charged

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• Trackpad and battery on stop working at same time

  - by Alex Krycek

  Gateway E-475M G Windows 7 Professional SP1 Synaptics TouchPad 15.2.20.0 Microsoft ACPI-Compliant Control Method Battery 6.1.7600.16385 It seems that when my battery stops working correctly, my touchpad will also act erratically. Specifically, the computer will charge for a few seconds, then stop charging for another few seconds. This will continue for some time. But if I close the lid, the charging LED will stay lit. As for the touchpad, it'll click or highlight things at random when I can get it to move. As a test, I stopped charging my computer. Now it seems my touchpad is working fine. I've tried to reinstall both the battery and touchpad drivers. I've also started the computer in safe mode, but that didn't help either. Edit: I've now tried booting my computer with an Ubuntu live cd, and the charging problem persists. So, it now seems my computer can only charge continuously as long as it's turned off or sleeping.

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• Macbook Pro 15-inch replacement battery.

  - by ricbax

  So I've finally got to the 300+ cycles with my MBP 2008's original battery. Apple is pretty much "on the money" too! I am at 79% Health and getting the Condition: Replace Soon warning. So I went out to the closest Apple Store and bought a replacement. I would like to get the same lifespan out of my replacement if possible. My question is: The battery comes with a 2 dot (green) charge on the indicator, should I put the battery in and let it run down and do a full recharge OR begin charging it immediately and then let it run all the way to empty and recharge?

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• Macbook Pro + Windows 7 (bootcamp) = Terrible battery life

  - by Scott Beeson

  I recently put Windows 7 Ultimate x64 on my wife's Macbook pro because of some software she bought for her business. Since then, the battery life has been abysmal. I've identified and researched one of the problems, which is display brightness. There is no brightness control in the windows power options, but I did manually turn it down in Bootcamp. However, it is still reporting very low battery life estimates. I'm wondering if this is because Windows thinks the display is at full brightness. Can anyone shed any light on this? (Pun intended). Also, are there any other things to look out for that may improve the battery life? (I mean in the context of Mac + Windows, not in general)

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• Flashing cursor with new laptop battery

  - by Fuzzy Purple Monkey

  I recently purchased a new, non-Toshiba battery for my Toshiba M700 tablet/laptop. The battery fits fine and the tablet detects and charges it, but when I try to boot up all I get is the Toshiba logo then a flashing cursor in the top-left. I can get to the bios, but no further. If I put the old battery back in, everything boots up fine. Has anyone else seen this problem? What am I missing? Thanks in advance!

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• It seems Windows 8.1 killed my two T60 laptop batteries

  - by rstock

  Upgraded Windows 7 to Win8 earlier this year, and last week upgraded to Windows 8.1. (Lenovo T60) Had no problem with battery usage when on Win7 nor Win8. After about a week of Win8.1 on my system, the battery stop working, while the system was on. The orange batt. indicator just keeps flashing. The system does not charge the battery (even though I know there was life in it). I installed a known good fully charged battery from another T60, it worked for aboute 40 mins then it instantly died in fron of my eyes. The system now shows the same orange flashing batt. light, but it is not charging. I know both these batteries are still good, they just appear to be dead. My research suggest that the new Win8.1 may not have updated the battery driver to Win8. I have since done that. Same problem. Research i s also pointing me to some 'smart chip' on the batteries that need to a reset. Is this possible ?? Does anyone know a process to reset the 'smart chip' on these batteries (fru# 92P1139) ????

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• How to estimate laptop sleeping time on battery ?

  - by ldigas

  In simple terms, if battery time is approximately known, how can one estimate how long a laptop can "hold on" in sleep mode, before battery goes dead ? Apart from literally taking a watch and measuring it ?

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• ibm t61 battery isn't charged

  - by treber

  I've just bought IBM T61 laptop and it has non-orginal battery. Everything was ok (laptop worked without being plugged), but something has changed, and now battery isn't charged. Power Manager says: "This system may not support batteries that are not genuine Lenovo-made or authorized. This sytem will contunue to boot, but may not charge unauthorized batteries" (screen: http://i52.tinypic.com/2ywhdns.png) I have no idea, what to do, how to solve this problem. Thank's for help.

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• laptop battery isn't seen

  - by doug

  Hi there, I have a laptop, which was most of the time on wired power. Now it seems to not work at all on battery and in Control Panel-Power Option battery isn't recognized at all(is 0%). Do you have any idea about what can I do? ps: my laptop is Acer Aspire 1640z and I'm using Windows XP SP3

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• New laptop battery: 80% capacity [migrated]

  - by Danilo

  I have got an old laptop (HP Pavilion DV2000, 5.5 years old) and I just bought a new battery for it (10,8V 5200mAh 6 Cells) probably not an original one. When I charged it full the first time, it reached a capacity (as see through the Ubuntu 12.04 Power Statistics tool) of 80%. After 3 full cycles, it's at 79.5%. Do you think it is normal, or the battery may be damaged (and I can complain with the vendor)?

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• New laptop battery: 80% capacity

  - by Danilo

  I have got an old laptop (HP Pavilion DV2000, 5.5 years old) and I just bought a new battery for it (10,8V 5200mAh 6 Cells) probably not an original one. When I charged it full the first time, it reached a capacity (as see through the Ubuntu 12.04 Power Statistics tool) of 80%. After 3 full cycles, it's at 79.5%. Do you think it is normal, or the battery may be damaged (and I can complain with the vendor)?

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• How to reduce the fan noise and how to increase battery life?

  - by mehdi

  I have a brand new Sony Vaio S series laptop.(VPCSA2DGX) It came factory installed with Windows 7 professional Edition 64bit. Runs Intel core i5, 500 GB HDD , 4GB Ram. First I installed ubuntu 11.10 64 bit along side Windows to dual boot. Later,since the problem did not solve, I installed ubuntu 12.04 64bit along side Windows to dual boot. However the problem keeps annoying me. Problem: When running ubuntu 11.10/12.04, the battery lasts only about 1.5 hours. The Fan runs loud and continuously. And there is a lot of heat generated. System monitor shows less than 5% CPU used. My laptop enjoys hybrid graphic and I tried turning off ADM graphic card and keep Intel graphic card on. However I can not get the Fan noise or heat to go away and consequently the battery drain continues. BTW, in windows, the laptop gives 4-5 hours of battery power, Fan is silent and there is no heat problem. Any ideas on how to reduce the fan noise and how to increase battery life in ubuntu 11.10/12.04?

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• How to reduce the fan noise and how to increase battery life in ubuntu 11.10/12.04?

  - by mehdi

  I have a brand new Sony Vaio S series laptop.(VPCSA2DGX) It came factory installed with Windows 7 professional Edition 64bit. Runs Intel core i5, 500 GB HDD , 4GB Ram. First I installed ubuntu 11.10 64 bit along side Windows to dual boot. Later,since the problem did not solve, I installed ubuntu 12.04 64bit along side Windows to dual boot. However the problem keeps annoying me. Problem: When running ubuntu 11.10/12.04, the battery lasts only about 1.5 hours. The Fan runs loud and continuously. And there is a lot of heat generated. System monitor shows less than 5% CPU used. My laptop enjoys hybrid graphic and I tried turning off ADM graphic card and keep Intel graphic card on. However I can not get the Fan noise or heat to go away and consequently the battery drain continues. BTW, in windows, the laptop gives 4-5 hours of battery power, Fan is silent and there is no heat problem. Any ideas on how to reduce the fan noise and how to increase battery life in ubuntu 11.10/12.04?

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• Laptop battery holds charge, but won't charge any more.

  - by Jeff

  Ok, I'm sure I will need to replace either my battery or my AC adapter, but would rather not buy one if the other is the problem. My problem is. I have a Sager laptop that gets quite a bit of use. The charging has always been a little bit odd. If I was in the process of using it, it would charge just fine and stay On AC power. If I left it alone, however(power settings to ONLY turn off the monitor) in either Ubuntu or Windows 7 it decides that it didn't want to use AC power anymore and would just start draining the battery until it died. Now, suddenly, it won't charge at all. The capacity was great up to this point which happened in an instant. It will recognize the battery but won't see the AC power if plugged in while the battery is in. I can power up the laptop without the battery and it works fine. If I plug in the battery while powered up it will claim it's charging it, but it stays at the same percentage. If I unplug the power, it will switch over to Battery fine, but I have to power down and unplug the battery to get it back on AC power. I've had dying/dead batteries before but they typically won't hold a full charge anymore but it still winds up to 100% then drops quickly when unplugged. This seems more like a chip problem in the battery to me, but I'm not sure. Any ideas?

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• Dell Inspiron N5110 Battery lasts only for 1.5 hours as opposed to 4 hours on Windows 7

  - by ubuntufan

  I've a Dell Inspiron N5110 laptop with the following specs: i5 processor 4 GB RAM NVIDIA GeForce GT540M Ubuntu 12.04LTS My laptop is overheating and the battery is lasting for only about 1.5 hours. I had checked if the battery indicator was problematic but it turned out it wasn't. I drained the battery to it's least possible value and that came to around 1 hr 40 minutes. In fact, I've the same problem with Debian and Xubuntu as well. I would like to get some proper solution for this. FYI: I've been having this problem since Ubuntu 11.04 but I'm not able to solve this in spite of trying various fixes like reducing brightness, Removing startup apps, Updating kernel and what not?. I'm a big fan of Ubuntu but this problem is stopping me from using Ubuntu and I'm using Win7 for 90% of the time.

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• Is there ongoing work in the kernel team to improve battery life under linux?

  - by leousa

  I have read in some forums that the kernel team is working on improving battery life and energy efficiency in linux. Unfortunately our community really lags behind windows and mac in that regard. I would like to read about the reasons why this difference exists with other platforms. Is it purely due to closed hardware specs from vendors or does it has to be with kernel design issues? Apple devices with unix cores have amazing battery times, but they also design their own hardware...just want to understand this issues in a less technical way I know that recent kernel updates in Ubuntu have improved the battery life in most computers, but I was wondering if there is still development going on and where can I read more about it. Thanks in advance

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