Because the battery is worn out and needs to be replaced for optimum performance.
You need to buy a new battery look up which battery works with your laptop and buy it online
It base on the model of your laptop, laptop battery has it's own model too. And different battery's model may fit one laptop model. Your question answered by battery specialist hklika.
There are different external laptop battery products available for purchase, but these are often used for travel accessories. Getting one of these batteries is a good investment if you plan to buy one to keep using your laptop after the regular battery has run out of power and you won't be near a wall outlet for awhile.
lithium
the battery charger and the charger are the same thing. the charger charges the battery and the laptop runs off the power from the battery. hope this helps
See below-
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http://www.udtek.com
copperCouldn't be more wrong. The correct answer is Lithium.
Laptop batteries have a finite lifespan. A laptop batter which is more than a year old may have less than half as much storage capacity.I would not buy a used laptop battery unless it was extremely inexpensive, and then only if I already had a battery i could depend on (would use the other as a backup)
Laptop battery packs can be purchased at any computer electronics store. These stores include Best Buy, Apple, Amazon, Battery Depot, and even on Ebay.