Before it needs recharged? Or before you have to purchase a new one? I have always had them stay charged for around 5 to 6 hours. I have had to replace them after 3 years.
About 3 years.
Batteries do incur "wear". The discharge/recharge chemical process is not 100% reversible. Over time that tiny little bit adds up. There are programs, like BatteryBar for Windows, that tells you what is the battery self-report factory capacity vs. current capacity. My laptop is 1 year old and it's got 12% wear on the battery, and it's almost always on AC.
The more the battery goes out of its comfort zone (which is usually defined as 25% to 75% charge) the more wear it gets. Most electronic device batteries are designed with usable life of 2-3 years.
Mine lasted for two years. Some months ago I bought a new battery and that is still very good. I use my laptop very often and I don't turn it off every day.
If they come with a warranty, they will probably last about one and a half what the warranty is, under normal use. The warranties are designed to expire before the batteries need to be replaced. By the end of the warranty your battery will probably hold much less charge and be almost useless. Though it will really depend upon how much you use it or, how often you let it run completely out of charge.
How long a full charge should last depends on the laptop, power consumption and battery capacity. My 1 year old ASUS K24J lasts about 90 mins at normal usage. 45 mins or less if rendering.
If you are asking for "until it needs to be replaced," that depends on when will the battery performance be so low you'll need a new one. Batteries degrade over time even if you don't use it. They degrade faster if you do. As for lap top batteries and how long is the service life of Li-ions, it depends really on how you use it. If you are careless, maybe six months or less. If you take care of it properly, maybe well over a year, or maybe two.
Not much new to add as everyone has basically addressed your question. Depending on how much you actually use your battery it should last 3 years. You may want to buy a spare now as it may be very hard to find one in 3 years. Also, if you rotated
Well, seeing that I am and have always been a nerd on such things. I would say the average battery life (with full charge) would last a max of 2 hours. But, there are ways that you can preserve the life of your battery. You could decreased the brightness of the screen, turn off devices like Bluetooth (if not in use), and keep your hard drive defragmented.
I depends on the brand, screen size, and processor. Most 15.4 inch screen laptops run for about four hours, but it depends on what you're doing on your computer. Word processing, WiFi, and listening to music can run a battery down a lot faster. If you do your best to preserve the energy of the battery, I'd say a good three to three and half hours should be about right.
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