Synergy Digital Laptop Battery, Compatible with HP 851477-422 Laptop, (Li-Pol, 11.4V, 4000mAh) Ultra High Capacity, Replacement for HP 2TT74UT, 2TT75UT, 2UA28UT, 851477-421, 851477-422 Battery - Walmart.com
HP Replacement Laptop Battery HS03 for 807956-001 807957-001 HS04 HS03 807612-421 807611-221 240 G4 HSTNN-LB6U HSTNN-DB7I - Micro Center