Batteries are the embedded power-source of a component such as a notebook. It is composed of cells of chemical elements that store energy.

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116
votes
10answers
43k views

Is it better to use a laptop on battery or on AC power?

When I'm at home, is it better to use the laptop plugged into AC power, or with just the battery, for the overall battery life?
32
votes
8answers
5k views

How can a CMOS battery store data?

How does a CMOS battery store information on it? I know it stores information such as the time, date, passwords and drive configuration, but how? How can a battery store data?
25
votes
2answers
941 views

How does Windows detect battery issues?

I have a laptop that's a little over 5 years old, and I've never changed the battery, so I believe Windows 7 when it tells me "there is a problem with your battery", and to consider replacing it. My ...
18
votes
8answers
773 views

Is a UPS a good investment for a home machine?

Is it worth the money to invest in a battery-backed UPS unit for a home machine? Or is it a waste of money? The purpose of the UPS would be to prevent a "meltdown" of the computer due to bad power ...
18
votes
8answers
845 views

What are some good practices for making sure my laptop battery serves its full life?

Basically, I'm looking for some do's and don'ts. Is it bad to keep my laptop plugged in when I'm not using it (majority of the time)? Is it bad to plug it in once I've finished using it (with it ...
17
votes
6answers
3k views

Does more RAM usage cause more battery usage?

I'm using a 2 year old 15" AMD laptop running Windows 8, and its battery life is not as long as the brand new ultrabooks for sure. In the place I'm currently working I don't have access to a power ...
15
votes
4answers
5k views

Can I run a computer using DC power?

I always thought that using a conventional UPS with a PC is highly inefficient. Power goes from AC -> DC -> AC in UPS and then AC -> DC in PC SMPS. Since PC works only with DC (12, 5 and 3 volts) It ...
15
votes
3answers
11k views

Software to hold battery at 50% charge level

My Sony Vaio laptop has a built-in program called "Sony Battery Care" which provides a functionality to hold battery at certain levels of charge while operating. For example, I've set it to 50% and ...
13
votes
8answers
6k views

Do newer laptop batteries still need to be drained before recharging?

10 years ago when I was doing hardware support it was best practice to fully drain a laptop battery prior to recharging in order to maximize its life. Is this still the case or can a battery now be ...
13
votes
3answers
4k views

Laptop Battery Technology

My laptop battery has finally taken the plunge and I'm looking online for a new one. However I'm getting lost in all of the specs of the batteries that are out there. I'm looking to gain a better ...
13
votes
3answers
2k views

Are notebook batteries generally hot-swappable?

I have a new HP Compaq 610. Most of the time I use it plugged and with the battery removed, to avoid wearing it. Sometimes I need to move it to somewhere else - currently I hibernate the machine, move ...
13
votes
1answer
1k views

Is it safe to store a battery in the freezer?

Of course, assuming you wrap it in a tight plastic bag to avoid humidity. I have a laptop battery at my office that's not currently in use, and also won't be used at least for the next several ...
13
votes
2answers
11k views

Can I run my MacBook in clamshell mode without being connected to power?

At home, I run my MacBook in clamshell mode (closed lid, external display). This works fine when you're connected to the power adapter, but it doesn't work when running on battery. That's how it's ...
12
votes
2answers
4k views

How long do Lithium Ion batteries normally last?

On the laptop I have, I've had to buy a new Li-Ion batter roughly every year. I do use this computer quite a lot, but I'm wondering if this is normal. Right now, my battery is completely dead (it ...
12
votes
3answers
802 views

Laptop Either Shows 100% or 0% Charge

I have a strange issue with my Compaq CQ 61 running Windows 2012 (server) and I have Googled for it really long and hard and also searched other questions here but in vain. I believe my problem is a ...
11
votes
3answers
13k views

Is it OK for the laptop to always be plugged in? [duplicate]

Possible Duplicate: Is it better to use laptop on battery or on AC power? If I stay near a power source is it recommended to always have my laptop plugged in? Or should I use the battery ...
11
votes
2answers
995 views

My Macbook is a Battery Denier

I have a four year old Macbook rev 1,1 (the original Intel Core Duo). Just recently it has begun denying the existence of its battery while still happily running unplugged. I get the X battery icon ...
10
votes
3answers
9k views

Should I remove my laptop battery? [duplicate]

Possible Duplicate: Is it better to use laptop on battery or on AC power? I keep my Thinkpad T60 laptop plugged in all the time. Should I remove my battery or if not, should I drain it ...
9
votes
3answers
7k views

Using a higher current charger on a laptop which requires a lower current [duplicate]

Possible Duplicates: Laptop power supplies, does current matter? Can I use a power adapter with more current but lower voltage on another laptop? I have an ASUS K50IN laptop which ...
9
votes
2answers
12k views

Can I use a charger with more output amperage than the device needs?

I've just bought a portable battery, but the portable battery don't comes with an adapter for the house current; it only comes with a USB cable so I can charge it with my laptop. My mobile phone came ...
9
votes
6answers
6k views

Why Ubuntu eats more power than Windows?

I play full screen video with maximum volume or browse the Web with WiFi. Under Windows 7 my laptop works ~5 hours. Under Kubuntu 10.10 only ~2 hours. I've got Acer Aspire 1810TZ. Battery wear ...
9
votes
6answers
11k views

What is the impact of leaving a laptop in “sleep” mode (while on battery power)? [closed]

How much battery would leaving my laptop at "sleep" mode consume? is the consumption low enough so that it would be safe to leave the laptop sleeping at nights regularily and using it tommorow? ...
9
votes
2answers
340 views

Buying a Laptop Battery - OEM vs. 3rd Party

Looking at a replacement 9-cell battery for my Dell 1525 I've noticed that the OEM batteries that Dell sells are up to 3x more expensive than batteries sold by a 3rd party vendor. Is the Dell premium ...
8
votes
4answers
3k views

Is it a bad idea to keep a Macbook pro always on? [duplicate]

Possible Duplicate: Is it better to use laptop on battery or on AC power? I never turn off a macbook pro I've at home. It's always connected with the power source, but with the lid closed. ...
8
votes
3answers
814 views

How to rebuild a Li Ion laptop battery?

I have an aging Gateway NX560XL laptop. The battery is toast and a new one, even aftermarket, starts at $130. So, to experiment, I began tearing apart the old battery to see what can be done. I ...
8
votes
3answers
2k views

Reviving a dead laptop battery

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 ...
7
votes
2answers
3k views

Is it a good Idea to switch to a SSD to use less battery?

I am thinking of buying a SSD for my laptop, mainly for the purpose of extended operating time when running on battery. At the moment I use a Hitachi HTS545032B9A300 (320GB) (Datasheet) as main drive ...
7
votes
2answers
1k views

What is an easy way to drain a laptop battery to 0?

I need a way to kill my battery in my Ubuntu laptop. Is there any mind numbing tasks I can Ubuntu do that will eat up the battery? I have already shut off the power management options. The battery is ...
7
votes
6answers
3k views

MacBook Pro: Should I put my battery out?

I'm quite new to Mac and OSX. I have my MacBook Pro now for about 4 month and I know there are a lot of battery-related questions around. I just noticed that after 4 month I have the following battery ...
7
votes
3answers
171 views

Is there a way to automatically disconnect a notebook from the eletrical power-supply?

I know this looks like weird and useless, but let me explain... I'm running Windows Assessment and Deployment Kit (Windows ADK) to make some tests on Windows 8 Preview. One of it's assessment is the ...
6
votes
4answers
6k views

Should I use UPS with my laptop to extend the battery life?

I recently bought a new Vaio laptop which has a 4400 mAh battery. I will use it at home most of the time, and I have an unused uninterruptible power supply (UPS). Should I remove the battery and ...
6
votes
4answers
3k views

Fastest way to drain battery

I'm using Mac OS X 10.7.1 on a Macbook Core 2 Duo. What's the fastest way of draining the battery without crashing the system and preferable by using some sort of a script?
6
votes
2answers
203 views

UPS - practical maintenance advices to help end-user keeping batteries (classic lead acid models) in good shape

I have read that most (maybe all?) UPS devices for personal computing have lead-acid batteries inside. As long as its chemistry, compared to lithium-ion, is very different, I would like to know ...
6
votes
1answer
6k views

Thinkpad T60 does not turn on

When I plug in the charge, the battery symbol and the charge symbol will light up green. Then, when I try to press the power button, the lights turn off and nothing happens. After this, the only ...
6
votes
5answers
19k views

Should I disconnect the power cable when the battery is full? [duplicate]

Possible Duplicate: Is it better to use laptop on battery or on AC power? I bought a new laptop (a Sony Vaio) and I am used to working on it while the power adapter is connected. Now that ...
6
votes
4answers
2k views

Control charging and discharging of laptop battery

Just heard that if Li-ion battery is kept at 40~60% charged, its lifetime will be longer. Is this correct? If so, are there some applications, respectively for Windows XP, Windows 7 and Ubuntu, that ...
6
votes
2answers
643 views

Battery stops charging at 84% and gets very hot

My laptop battery always charges to about 84% to 87%. Once it reaches a charge level in that range, it stops charging, but Windows says it is "plugged in and charging". Because it has not reached ...
6
votes
5answers
13k views

Can you plug-in the battery while laptop is on AC only?

I'm using my laptop at home with battery removed and only connected to the AC power. However I'm lacking the mobility as my power cord is kinda short. Is it safe from electrical point of view to plug ...
6
votes
4answers
2k views

How to display battery discharge rate in watts, Windows 8 + perfmon

Windows 'perfmon' utility allows to display graphs for different counters. One of them is Battery -> "Discharge rate" that can be spotted in the internet as a good way to examine battery discharge. I ...
6
votes
3answers
25k views

Laptop Battery Diagnostics Software? [closed]

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 ...
6
votes
5answers
2k views

Are OEM batteries the best way to go?

I have a two year old of which the battery just died - the laptop will only work if plugged in. Are non-OEM batteries just as good as OEM batteries?
5
votes
5answers
6k views

Logitech M705 Wireless Mouse: Are the batteries dying, or does the device have a hardware failure?

I have a Logitech M705 wireless mouse. I'm first time using a wireless mouse, so I don't have much experience with the hardware features and behavior. It is rated that it runs for 3 years with the ...
5
votes
6answers
3k views

Laptop dies when unplugged

I was on the road and had my laptop plugged directly in the wall without a surge protector. A storm hit, the lights flickered and my laptop made a popping sound (scary). Everything works fine when ...
5
votes
8answers
42k views

Is it safe to operate a laptop without battery?

I know it's 'unsafe' in terms of data loss but I noticed motherboards still have some of their circuits on power when they are plugged in [e.g. a circuit that must wait for power-on signals is ...
5
votes
3answers
6k views

How does limiting a laptop battery's full charge to less than 100% extend its battery life?

My laptop lets me limit how much of the battery will charge before reaching full charge: At first, I understand what the intent is. I know that overcharging a battery will result in degradation of ...
5
votes
2answers
8k views

is a CMOS battery rechargable?

if so, how does it's recharger look like?
5
votes
4answers
4k views

Battery charge suddenly drops from about 25% to 6%

I own a Lenovo Y500 series laptop. The battery being an year old lasts only 1 hour. But the strange thing is that, when the charge comes down to 25-20 it drops to 6%(critical battery level) in a ...
5
votes
3answers
1k views

How to check if power cable is connected from the command line?

I'm running ubuntu on my notebook and I need a way to check (from the command line) if the power cable is connected. Is there any system file that keeps log of this? or is there a bash command that ...
5
votes
4answers
3k views

Is it possible to test an UPS battery without having the UPS nearby?

I just started with a new company and they have a stack of replacement batteries for UPS's located at the branch offices. The problem is, no one knows if these batteries are good or not, and the ...
5
votes
2answers
320 views

CMOS, BIOS and battery

As far as I know, if the BIOS has a password set, you can reset it by removing the battery and inserting it again. Why is this so? Do all the CMOS settings reset to default after such a manipulation ...