Each battery has a limited life, no matter what device is power. Batteries are not different than normal cells, except they are a finite number of times recharging. Under normal rechargeable batteries have a shelf life of 250-500 charge cycles (depending on type used).
The lithium-ion Laptop batteries are chemically degrade over time and temperature. Once the battery cells are the "clock is ticking product." The battery life lasts depends on how the company (ie, remain cool, and he never left in a discharged state for months at a time).
Keep laptops and Tablet PCs as fresh as possible and store about 50% charge level or higher. A battery was at 40 ° C in full sun to deteriorate much faster than at 20 ° C in a refrigerator. For example, if you do not fully charge the Toshiba PA3534U-1BRS battery if it is kept for one year at 40 ° C only has a capacity of 65% at the end of the year. It is, after only one year to 65%, as it did when it was news! However, if you save it under a load of 40% at 25 ° C or less for one year, which will have a capacity of 96% at the end of the year - that is, as new!
Make sure there is enough ventilation around a laptop computer and prevent them in an enclosed space over, unless adequate ventilation can be ensured. This is because the network will be able to continue to discharge heat, so they are, and that the air around the Toshiba PA3356U-3BRS battery and notebook battery while in the heat. If you have multiple laptops or Tablet PC and the adapter into an enclosed space, the batteries are kept warm for long periods. In particular, the power at the top or near the battery compartment during use or the tax has a negative impact on battery life is only six months.
If a lithium-ion Toshiba PA3465U-1BRS Battery is always kept fresh, which should last several years. If stored at high temperatures for most of his life, and especially, much more than a year. This is why most manufacturers do not guarantee the battery for a period of three months and one year (maximum).
For the same reason, never buy a spare battery for use later this year or next year. The lithium-ion Toshiba PA3450U-1BRS batteries begin to degrade when they are executed. So just buy a new battery if you need to use it.
For laptops stored for long periods (six months or more, for example), charge (ideally 50% or more but not less than 40%) and remove them from the laptop before putting it in a place expenses (but not below five degrees entigrade). This process of reducing the degradation of the battery during storage.