Battery Technology (BTI) is a global supplier of replacement batteries and AC power adapters for notebook computers, batteries for digital cameras, PDA's, and other mobile devices and batteries for APC UPS systems. Features 100% OEM compatible and 30-40% less expensive than the OEM. Replacement battery for Dell laptops. Features 1891mAh capacity and one cell. Li-ion chemistry allows for long-lasting quality without memory effect. Battery energy: 7Wh. 3. 7V output voltage. 18-month manufacturer limited warranty