Laptop Battery for HP 44Wh Li-Pol 11.4V 3900mAh Black, ProBook 640 G2, ProBook 645 G2, ProBook 650 G2, ProBook 655 G2 The growing demand for consumer electronic devices for home and leisure poses the challenge of upgrading, improving and enhancing existing devices. In CoreParts you will find a wide range of alternative batteries for Consumer Electronics, that matches the performance of your original device. All manufactured by high-end, certified and trusted suppliers.