DESC: The Energizer ER-L210 Li-Ion battery is an exact replacement for your notebook's original battery and provides extended runtime for today's demanding notebook computers. Longer Lasting - Maximum runtime for your laptop versus standard NiMH batteries. Long Run Time - The run time of your battery will vary by individual notebook computer - based on the applications being used, the number of times something is saved or retrieved from the hard drive and/or CD-Rom drive, the memory of the notebook, and the chemistry and capacity of the battery. No Memory Effect - No need to fully drain your battery before each charge. Charge your notebook battery to full power anytime.