Replacement Laptop Battery for HP KU531AA - Fits in HP ProBook 6440b; HP Business Notebook 6530b, 6535b, 6730b, 6735b; HP EliteBook 6930p, 8440p, 8440w; HP ProBook 6445b, 6450b, 6545b, 6550b, 6555b

Lithium Ion (Li-Ion) battery chemistry delivers energy to the notebook through an easily controlled reaction Delivers 10.8 V DC to your compatible notebook, ensuring that your device is ready to use when needed Offers a reasonable fit to your notebook More environment-friendly as compared to the disposable ones