Dell 312-0148 replacement extended battery provided by Batterystandard.com is designed for use with the Latitude X300 series. The LDE-28 is designed to replace OEM part numbers: W0465, 312-0148, F0993, W0391, 320-0106 and P0382 and provides around 100% more runtime than the standard battery. Amstron laptop batteries are precision-engineered and rigorously tested for voltage, capacity, compatibility and safety to exceed original equipment manufacturer specifications..