Premium 6550b Battery: Our hp probook 6550b battery is a premium 58Wh battery that has passed UL testing, ensuring safety and quality. It is fast charging and lasts long, perfect for your laptop needs. Compatible Part Numbers: 4458640-542 / 482962-001 / 484786-001 / HSTNN-144C-A / HSTNN-144C-B / HSTNN-145C-A / HSTNN-145C-B / HSTNN-C66C-4 / HSTNN-C66C-5 / HSTNN-C67C-4 / HSTNN-C67C-5 / HSTNN-C68C / HSTNN-CB69 / HSTNN-XB61 / HSTNN-XB68 / HSTNN-XB69 / KU531AA. Long-Lasting Probook 6450b Battery: The probook 6450b battery features a fast charging and long-lasting performance. It can be recharged more than 500 cycles, making it a reliable power source for your laptop. HP Compaq Business Notebook 6500b / 6530b / 6535b / 6700b / 6730b / 6735b; HP EliteBook 6930p / 8440p / 8440w; HP ProBook 6440b / 6445b / 6450b / 6540b / 6545b / 6550b / 6555b TD09 TD06. Reliable TD06 Battery: Our td06 battery is compatible with various models including 6530b battery, battery for hp probook 6550b, 6440b ba