Laptop Battery, Ac Adapter, Hard Drive, etc.

Most laptops now use lithium ion (Liions) batteries. Lions should be managed differently from the Nicad or NiMH batteries used in older laptops. In particular, Lions should not be run all the way down to prevent "memory effect". First, they don't have a memory effect, and second, running them down tends to reduce their capacity. If the laptop does not need the battery it should be run to about 40% charge and stored in a cool place. Liion batteries go bad whether used or not, so only buy new Liions. Typical life is 2-3 years.

Laptop Battrties are specifically designed for each laptop brand and model. Laptop batteries are all fundamentally different from one another and cannot be substituted unless the laptop has been pre-configured from the manufacturer to accept more than one type of battery chemistry.