Store Dell Studio 1558 battery in a clean, dry, cool place away from heat and metal objects. Do not charge to higher voltages than its threshold voltage. Do not need to discharge them fully and recharge constantly, to do a full discharge only about every 30 charges.
http://www.notebookbatteryretail.com/dell-studio-1558-battery.htm Type: Li-ion
Dimension: 284.6 x 48.3 x 37.7mm