Always on the go- No more worries for running out of battery power! You can back up your system with this 4-Cell Lithium-Ion Primary Battery from Dell™. It has an internal circuit board with chips that allow it to communicate with the notebook to monitor battery performance, output voltage and temperature. It also gives the notebook an accurate 'fuel gauge' capability to determine how much battery runtime is left before the next recharge is required. This product has been tested and validated on Dell™ systems to ensure it will work with your computer and is compatible with Dell™ Latitude™ X300 Notebook. It is supported by Dell™ Technical Support when used with a Dell system.\n\nHighlights\n28 WHr capacity lets you work seamlessly while on the move\nProvides very safe charging and discharging\nOffers reliable power for dependable performance