How to extend the life of your laptop's battery charge

In this instructable, you will learn how to extend the life of a laptop's charge. If you are going to be flying or driving long distance, these steps can help make the battery last much longer then usual and make the ride a little less stressful.

There are many simple steps and some more complicated steps but in the end, I was able to achieve an 8 hour charge on my year old laptop. The results will vary for your laptop if you have an inefficient CPU or a high RPM hard drive the gain will be smaller, but generally you will gain more time out of one charge.

In some cases, following these steps can even extend the life of the battery. Which means savings of 100 dollars or more.

The laptop used in this instructable is a HP Pavilion DV5130ca

Specs:

2.0 GHz - AMD Turion 64
120 Gigabyte 4700 rpm
Broadcom 802.11b/g wireless adapter
128 mb ATI Rage Mobile
Windows XP MCE 2005

All other specifications are insignificant when configuring a PC for power management.

Step 1: Start Simple

Well for those who don't want to get into installing programs and buying a new battery, these are some simple things you can do to extend the life of a charge.

1. Reduce the brightness of your monitor to the lowest readable level.

The backlight in most laptops are like "mini-fluorescent" (cold cathode) bulbs. They will really drain your battery quickly.

2. Turn off your wifi when you do not need it.

The wifi card is another power hungry device. Think of this - when you make a call on your cell phone, the battery drains very quickly, but if you simply play games or listen to music, it can last a very long time. This is the same idea. The wifi card is "calling" the hotspot all of the time. Even if there isn't a hotspot around, it is continuously looking for one.

3. Use windows primitive power management to control your CPU.

When unplugged from the wall, click on the battery in your task bar and click max battery. This will extend your laptop's life because your CPU will be reduced to a slower speed. (continue reading for a better explanation of reducing your CPU's speed as this makes a HUGE difference in the length of your battery charge.)

4. Unplug unnecessary peripherals.

Unplug that USB light or your wireless mouse when you don't need them. Although minor, these devices could give you those extra few minutes of charge.

Comments

[dutchguy]

 AWESOME !!!
I have exactly the same laptop!

[beauwalker23]

Okay, those speakser..the Circle ones on the 1st picture. Are the Apple speakers? And are they hooked up to your windows running computer? HOW?! or what are they hooked up to?

[computerwiz_222]

I live in Canada, so we have The Source by Circuit City. These speakers are made by their house brand "Centrios" They are called the color-wave system (or something similar to that...). Unfortunately, they have been discontinued, and I picked these up on clearance. They are regular $149.99 but i got them for 29 bucks! They are not apple, but look like them. They connect using a standard 3.5 mm stereo jack. I now use them with my macbook (I have made the switch and never looked back!) If you do buy these speakers, you will need a subwoofer though. They are lack the low frequency response that name-brand speakers (and larger) speakers can provide. I have them connected to my JBL 200 watt 10 inch sub, which really makes the whole thing sound great. They sound great and the change color when music is played through them. Check ebay, they still may be available!

[beauwalker23]

thanks for the quick response. Yeah i found the speakers at a garage sale for $1. But I think they only work with an earlier version on Mac. Got a weird little jack that mac put on there (damn you steve jobs). But i hope I can find an adapter. They do not need to be pluged into an outlet, thats why I got them, and they looked sweet! cheers, -beau

[computerwiz_222]

If they do not require an outlet, then they are not-powered speakers. This means that they will require an amplifier unless you want to destroy your audio output by running it at the wrong impedance. I recommend you build a TDA2002 based amplifier. They cost around 7 or 8 dollars per channel and 10 watts is plenty for these small speakers. I would recommend that you disassemble the speakers and use your multi-meter to figure out the pinout and then change the connector to something more standard and build a small inline amplifier. Good Luck!

[computerwiz_222]

oh and i forgot - extending the battery life on the macbook is almost pointless - the power management done through OS X Leopard is simply fantastic. I have tried under-clocking, disabling a core, more frequent hard drive spin downs (i back up often!) and i noticed a very nominal increase (maybe 20 minutes?) at the cost of a less responsive machine. OS X is continuously changing the clock speed of the CPU and using some of the more advanced features of the Core 2 Duo and its chipset to manage power very effectively. All I can say is dim your screen, turn off wifi and bluetooth and you will get optimal battery life. CoolBookController will have little effect on overall battery life.

[hearthunter4gf]

thanks this is really good working

[mowie]

i have a hp laptop its about a year old and the battery lasts for about 20 mins lol

[klee27x]

Lithium cells shouldn't be discharged nor charged all the way for the best longevity. To make them last as long as possible, they should be stored at about 80% charge, or around 3.8-3.9V per cell. Two weeks is nothing to a lithium battery. They will hold 98-99% of their charge after two weeks. I'm not sure what discharging every two weeks would accomplish. I would say, be sure to take them out of the laptop when it's plugged in, though, cuz the laptop will keep them topped off at 4.2-4.3V per cell, which will degrade overall longevity.

[Ian01]

I thought they should be stored at 40%...

[klee27x]

Yeah, true.. stored at 40% and in the fridge/freezer for optimum life. But if you are actually using it, 80% is a pretty good compromise. I misspoke. Even if the battery management is top-dog on your laptop, leaving the battery in it when unused will expose it to the heat of the laptop. So there's no way that leaving it in will improve base longevity.

[Sypran]

I thought Mythbusters prooved that the battery in the fridge or freezer only makes the battery live for 1-2 min or sothing so small it doesn't realy matter -_-

[klee27x]

I mean, leaving it in when it's charged and the cord is plugged in, anyways..

[sotsirh194]

Is it bad to leave my laptop plugged in almost all the time? I have a Dell inspirion 1525

[computerwiz_222]

I would say that you should probably just pop out the battery when not using it for long periods of time. I usually drain it to anywhere between 50 and 80 percent, then pop it out if I am not going to be using the battery for a couple of weeks. Leaving it fully charged while out of the laptop won't really hurt it either. I have a few laptops that are over 5 years old and their lithium batteries still hold over three hours of charge. Leaving the battery in the laptop will keep the voltage at the highest rated. If you pop it out, then it will allow the battery to "relax"... Macbook's are great, because they allow the battery to drain until around 95 percent, then they pick up again. The laptop isn't using the battery, it is just the natural effect of rechargeable batteries.

[klee27x]

Call me paranoid, but I believe that some manufacturer's KNOWINGLY OMIT simple battery preservation features on certain models in order to "stimulate the economy." Most of the time, it's easier to just go along with them, though. One warning about partially discharging the battery before removing it: some laptop batteries self-drain at a ridiculous rate due to all the "smart" circuitry. I left a fully charged and perfectly good laptop battery in the fridge for a year, and it ended up damaged.. 2.8V per cell. Some loose cells that had been in there longer than that still measured 4.15V per cell.

[raykholo]

the help thing on my new hp laptop says that for the best performance you should keep it plugged in as much as possible, and i have the extremely extended battery (about 4 hours) is this a problem or something? laptop - hp dv2500 14inch display - the one without the built in cell network thing

[Patrik]

"Be sure to regularly discharge the battery at least once ever two weeks."

Unlike the old NiCd batteries, this isn't supposed to be necessary for the newer Li Ion ones. Very different chemistry, no "memory" effect - no reconditioning necessary.

Excellent advice otherwise.

[Ian01]

You still should calibrate the charge controller every once in a while by fully discharging and recharging. This lets the controller give you more accurate readings as the battery slowly degrades. It does nothing for the cells, though.

[Derin]

my laptop battery is worthless,only lasts 2 mins,not enough comon sense to replace the cells which are NiMH since i only sleep for 7hrs

[computerwiz_222]

I would say that it is probably worth it to replace the cells if it only lasts 2 minutes... It costs around 30 to 40 dollars and takes about an hour or two. You may also want to consider zapping the batteries too... I have a laptop from 1997 with NICD batteries. I zapped the individual cells with 12 volts from an SLA battery. After zapping and charging, I managed to get the old 486 to run for nearly 2 hours on battery. I was playing MP3s too which run the CPU at 100 percent. Before zapping, it shut off the moment I unplugged it...

[Derin]

well,i cant dare to open the case and the replacements are not being produced anymore(the nimh replacements)

[Derin]

and i also use it as a desktop pc now,does not do the alarm when the battery is out

[raykholo]

my dad used to have a slightly worse version of that laptop, then it got hit and now you have to hit the lower right hand corner (by the dvd drive under the keyboard) regularly to make it not freeze up -- now theres a block at the spot keeping it up any ideas for a fix?

[computerwiz_222]

Sounds like a loose IDE connector or something in the DVD drive is causing the computer to think there is a disc in it, or maybe the drive is disconnecting and reconnecting rapidly which is causing all kinds of interrupt requests. Check with HP, or at least call a tech. I'm no computer technician, but I have rebuilt and repaired a few laptops.

[raykholo]

thanks but i dont think thats the problem-- and the warranty is way past expired but with your expertise -- do you know if there are any important wires running by that area? im thinking that could be it

[computerwiz_222]

Well if there are any important wires, which there are. (They are on the circuit board) Good luck fixing it... Maybe try reformatting? Also, I have a feeling that removing the DVD drive may solve your problems. Usually, the mechanical components of laptops go before the electrical components. If a motor is jammed, or an end sensor is bent, or damaged, then the computer will not run properly because there will be strange signals coming out of the drive. Try removing the drive to see what happens.

[raykholo]

i dont think formatting will help cause i reinstalled the os and the problem is still there- that was a long while ago now - how can i remove the drive? and uh - end sensor?

[computerwiz_222]

Inside CD-ROMs and DVD-ROM's, there is a sensor. It is called an end sensor. Essentially, when the tray is closed, it pins a flap of metal against another piece of metal to let the drive know it is closed. Usually there are two of these. If it is bent, the computer could be continually thinking it is open, or closed or rapidly flicking back and forth repeatedly. Find a service manual to remove the drive, I'm not an encyclopedia... I'm sure there are some out there. You could also call HP and be like "ya I just ordered a new drive how do I swap it?" They might help you. I think I've helped as much as I can. Good Luck!

[raykholo]

ok thanks again

[DannyboyINXS]

also, if you hit the laptop somewhere which is causing it to freeze often, i suggest you open it up and make sure all the connections are okay, because like computerwiz said above, it could possible be a loose IDE connection with my past experiences with these parallel cables, they tend to freeze up when u connect them (or in your case, accidently) to the mainboard while the computer is still on. It is a common problem with the desktop's aswell - most of the new laptops dont have that problem because the new serial cables (SATA) allow for flexible removal.

[raykholo]

i ll take a look and tell u what happens later thnks

[wesie42]

I can see that u have limewire, have u been doing any illegal downloading?

[raykholo]

now do you really think hes going to answer that?

[masterchrisx3]

if you have a vista insted of all this just click your battery level to power saver and DONE

[computerwiz_222]

Although I agree, using the power saving utility will clock the CPU even lower, thus saving you more battery life. If you are on a flight, and you want to watch downloaded TV shows, you don't need a powerful computer. To play movies, and TV shows in various formats (avi, mp4, mpg etc...) you only need about 800 Mhz, sometimes less. I have a pentium 2 that plays 320 x 240 no problem. If you down clock your already efficient computer, it will last even longer.

[GorillazMiko]

Neat! This is really cool, your table looks cool, with those glowing things on the side, nice job.

[computerwiz_222]

lol those are speakers that I bought at the Source on clearance for like 40 bux (reg 149). I couldn't believe it. They change colour to the beat of the music or you can set them to a static colour. They sound GREAT too!

[LinuxH4x0r]

Cool! I personally don't have a laptop, but my dad has one with a shot battery. For his I use a car jump starter and an inverter.

[computerwiz_222]

funny you say this, i do the same thing when the power goes out or when I am working up north. I have a golf cart up north that I use to run a children's day camp type thing and I use the laptop to play music through speakers to make it a little more exciting.