This is a brand new Dell replacement battery for the Studio 14z, 14zn, 1440, 1440n, 1440z series.
The superior South Korean cells inside the battery cartridge will provide longer run times between charges as well as a longer service life than cheaper batteries. In addition, Li-ion batteries are not subject to the memory effect common with older battery technology. This means you can recharge your laptop any time without diminishing your battery capacity. This laptop battery replacement is typically superior to the original battery and is 100% compatible with your Dell Studio laptop computer. The battery is individually tested before shipment and backed by 30 day complete satisfaction guarantee and a 2 Year warranty.

This battery is rated at 11.1 Volts and is NOT COMPATIBLE with 14.4V or 14.8V. Not all computer batteries have the same capacity and run times. The higher capacity battery cells inside this cartridge have an energy capacity of 5100 mAh. These are the some of the highest capacity Li-ion batteries on the market today and superior to batteries rated at 4400 & 4800 mAh. This battery will deliver up to 20% more run time than cheaper 6 cell versions of this battery.