Laptop Battery for HP ProBook 440 G0/G1 445 G0/G1 450 G0/G1 455 G0/G1 470 G0 g1 | eBay
Superb Choice 6-cell HP ProBook 450 G0 Series, 450 G1 Series Laptop Battery - Walmart.com
Battery HP ProBook 440/450 G0/G1 4400mAh Li-Ion 11,1V - IMMAX.cz
Synergy Digital Laptop Battery, Compatible with HP ProBook 450 G1 Laptop, (Li-ion, 10.8V, 4400mAh) Ultra High Capacity, Replacement for HP FP06 Battery - Walmart.com
HP ProBook 450 G4 Battery Replacement - iFixit Repair Guide