Amazon.com: TREE.NB CA06 CA06XL Battery for HP ProBook 640 645 650 655 G0 G1, fits Hp Spare 718677-421 718678-421 718755-001 718756-001 HSTNN-DB4Y HSTNN-LB4X HSTNN-LB4Y HSTNN-LB4Z HSTNN-LP4Z : Electronics
MBXHP-BA0178, CoreParts Laptop Battery For HP 39Wh 3Cell Li-Pol 11.4V 3400mAh Black, HP: HP ProBook 640 Series HP ProBook 640 G2 SeriesHP ProBook 645 Series | EET
Battery 48Wh original suitable for HP ProBook 650 G4 - sparepartworld.com