Cheap And Discounts 11.1V Laptop Battery for HP ProBook 640 G1 640 645 650 655 Series CA06 CA06XL CA09 HSTNN-DB4Y HSTNN-LB4X HSTNN-LB4Y 4400mAh Wholesale. Buy Directly From Merchant ApexWay Official Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.