Our state of the art Dell D400 compatible notebook battery is designed and manufactured under strict European ISO 9001 standards. It meets and exceeds high priced OEM products, allowing you to power your computer with a superior quality battery for a fraction of the price! We stand behind our products by offering 18 Months Manufacturer warranty. This includes ONE Compatible Laptop Battery and ONE Mini Mouse. Compatibilities: Dell D400 and model Latitude D400, Dell 312-0078, 7T093, Dell 0U003, Dell 312-0078, Dell 312-0095, Dell 6T087, Dell 6T216, Dell 6T751, Dell 7T093, Dell 7T534, Dell 8T016, Dell 8T063, Dell 8T0804, Dell 8T531, Dell 8T533, Dell 9T119, Dell 9T540, Dell 9T543, Dell U0521, Dell W0628, Dell X0362, Dell X0363, Dell Y0175.