This 3 cell battery is no longer available. The high capacity 6 cell version linked below is still available. Lenovo 42T4523 Battery for ThinkPad X300 This brand new Lenovo replacement laptop battery features lithium-ion cells. Li-ion battery technology provides longer run times with less weight. This 42T4523 battery replacement is 100% compatible with the original Lenovo battery specifications and is individually tested, inspected and backed by a 2 Year warranty. Tech Specs Xtend brand; 10.8 Volts - also compatible with 11.1 Volt systems; 2800 mAh; 3 Cell Li-ion (6 cell LEN-X300XT); Samsung (South Korea); Black; Assembled in China; 2 Year Warranty; 30 day full satisfaction guarantee; 300-500 recharge cycles; You can expect about 3.5 - 4.5 hours of run time with this Lenovo 42T4523 battery when new, depending on your energy use.
If you are looking for even longer battery run times, check out our Long run ThinkPad X300 battery. Replaces these
Lenovo battery part numbers: 42T4518 42T4519 42T4522 42T4523 42T4643 42T4519 42T4641 43R1965 43R1967 73R1965 Battery 49+