Well, there no exact date or a certain number to change a laptop battery. Most people I know just change it when they feel the battery can hold much power anymore, usually when the battery lasts for 4 hours to 2.5-2 hours. Just change it as you see fit, if your laptop runs out of power alot or how long it can hold a charge goes under like half then change it. But some batteries for laptop cost quite a bit. My replacement for a Dell Inspiron 500m battery was around 80 dollars. Probably a little less now
Dell Inspiron E1705 battery
Dell Inspiron 7100 battery
Dell Inspiron 7150 battery
Dell Inspiron 7500 battery
Dell Inspiron 1100 Series battery
Dell Inspiron 1150 battery
Dell Inspiron 5100 Series battery
Dell Inspiron 5150 battery
Dell Inspiron 2200 battery
Dell Inspiron 3000 battery
Dell Inspiron 300M battery
Dell Inspiron 710m
Dell Inspiron 8500

Question:My Dell Inspiron 9400 battery are geting very hot?

Answer:you can dell customer service - Dell has recently had a recall on some of its batteries for shorting out and causing fires. Yours might be part of the recall

Question about charge your laptop batteries

It doesn’t damage your battery directly, but it will shorten the lifetime of the battery. The battery can be reconditioned, but will still not perform like it used too. I always tell people that they shouldn’t use their battery unless they really need too. And they should only charge it when the battery is at critical low. Doing this will make your battery last a lot longer. You should know that many notebook companies will only warranty a battery for one year. -even if your notebook has a longer warranty. Pretty much all companies that make notebook batteries agree that the average lifespan of a battery is 1 year. But doing the steps I susggested can make it last many many years.

 Dell Latitude CPi battery
Dell Inspiron 1000 battery
Dell Inspiron 1300 battery
Dell Inspiron 300M battery
Dell Inspiron 500m battery
Dell Inspiron 510m battery
Dell Inspiron 640m battery
Dell Inspiron 630m battery
Dell Inspiron 600m battery
Dell Inspiron 700m battery
Dell Inspiron 8600 battery
Dell Inspiron XPS battery
Dell Latitude D420 battery
Dell Latitude D410 battery
Dell Latitude D400 battery
Dell Latitude D600 battery
Dell Latitude D610 battery
Dell Latitude D620 battery
Dell Latitude D800 battery
Dell Latitude D810 battery
Dell Latitude D820 battery

Do i need buy a external battery for my laptop?

Question: i have a toshiba laptop and the battery is only can lasting at most 30 mins. at uni and will use the laptop in lectures etc i will need to be able to use laptop without it being plugged in.

i have been told that you can get external batteries that will last like 4 or so hours.

Answer:it really all depends on the type of laptop you have. since you have the sony laptop, check out the sony website and see what is recommended for your laptop. som batteries will work, others won’t.

Dell Latitude X300 battery
Dell Latitude X200 battery
Dell Latitude D500 battery
Dell Latitude D505 battery
Dell Latitude D510 battery
Dell Latitude D520 battery
Dell Inspiron 3800 battery
Dell Inspiron 4000 battery
Dell Inspiron 4100 battery
Dell Inspiron 4150 battery
Dell Inspiron 8000 battery
Dell Inspiron 8100 battery
Dell Inspiron 3700 battery
Dell Inspiron 3500 Series battery
Dell Inspiron 3200 battery
Dell Latitude D420 battery
Dell Inspiron 7000 battery

Question:Where can i buy IBM laptop batteries in hong kong?

Answer:you can buy i on this website ,it it local in shenzhen.http://www.new-laptop-battery.com/

Is there a recall on Toshiba Laptop Batteries Toshiba PA3107U-1BAS battery？

Go to the toshiba website and download the batterycheck utility - it is a small program that will run and collect some information about your computer, and then tell you if your battery is one of the series that has been recalledToshiba PA3009U-1BAR battery
Toshiba PA3009U-1BAT battery
Toshiba PA3009UR-1BAR battery
Toshiba PA3010U-1BAR battery
Toshiba PA3038U battery
Toshiba PA3038U-1BAL battery
Toshiba PA3038U-1BRL battery
Toshiba PA3062U-1BAR battery
Toshiba PA3062U-1BAT battery
Toshiba PA3084U-1BAS battery
Toshiba PA3084U-1BRS battery
Toshiba PA3098U-1BAS battery
Toshiba PA3098U-1BRS battery
Toshiba PA3107U-1BAS battery

My old Toshiba  laptop is around 4-5 years old now. I used to get 8 hours life per charge, now I’m getting around 5-6 hours per charge, though i have stopped using it now.Toshiba PA3248U-1BRS battery
But this depends on the batteries, lots of new developments in rechargeable power cells, the latest batteries will be ion the top end laptops. cheep laptops will use older/cheaper type of cells.
If you getting around 8 hours or more laptop power per charge, then you have the better batteries type.

You need to fully charge the cells when the laptop is new, then run it right down, this helps the batteries to last longer.Toshiba laptop battery
Toshiba PA2467U battery
Toshiba PA2487U battery
Toshiba PA2505UR battery
Toshiba PA2506UR battery
Toshiba PA2510U battery
Toshiba PA2522U-1BAS battery
Toshiba PA2522U-1BRS battery
Toshiba PA3000U-1BRS battery
Toshiba PA3001U-1BRM battery
Toshiba PA3002U-1BRL battery
Toshiba PA3009U battery
Toshiba PA3009U-1BAR battery
Toshiba PA3009U-1BAT battery
Toshiba PA3009UR-1BAR battery
Toshiba PA3010U-1BAR battery

Dell recall some laptop batteries.

What’s the difference between the 4-cell, 6-cell, and 9-cell laptop batteries?

Answer: the more cells, usually the higher is the capacity and the more reliable the battery. IBM FRU 08K8214 battery
IBM 92P1075 battery
IBM ASM 92P1076 battery
IBM 92P1089 battery
IBM 92P1091 battery
IBM 92P1101 battery
IBM 02K7034 battery
IBM 02K7037 battery

Whats the difference between:

6 Cell Lithium Ion Battery

vs.

High Capacity 6 Cell Lithium Ion Battery

vs.

12 Cell Lithium Ion Battery

Answer:

There are differences may be the hours it lasts if fully charged, length of time it takes to charge while system is on or off. Plus one thing that you have to look at is the power options is it set for laptop or maximum battery  .ibm laptop batteries list:IBM 92P1087 battery
IBM FRU 92P1083 battery
IBM FRU 08K8193 battery
IBM 08K8192 battery
IBM 08K8193 battery
IBM 08K8195 battery
IBM 08K8214 battery
IBM 92P1011 battery
IBM 92P1060 battery