HP ProBook 4210s 4310s 4311s Extended Run Battery This is a brand new HP ProBook Extended Run battery which runs twice as long as the original 4 cell battery. This battery is going to be physically larger than the original and will cause the back of the laptop to tilt up slightly allow for more air to flow underneath the computer. The superior South Korean cells inside the battery cartridge will provide longer run times between charges as well as a longer service life than cheaper batteries. In addition, Li-ion batteries are not subject to the memory effect common with older battery technology. This means you can recharge your laptop any time without diminishing your battery capacity. This laptop battery replacement is typically superior to the original battery and is 100% compatible with your HP ProBook 4210s 4310s 4311s notebook computer. The battery is individually tested before shipment and backed by 30 day complete satisfaction guarantee and a 2 Year warranty. Brand: Voltage: Battery Capacity: Battery Type: Cell Origin: Color: Warranty: Guarantee: Useful Life: HP replacement computer battery 14.4 Volts 5200 mAh 8 Cell Li-ion Samsung (South Korea) Black 2 Year Warranty 30 day full satisfaction guarantee 300-500 recharge cycles Check your current battery to ensure you are ordering the correct battery. It should match the picture above. This high capacity battery will provide about 4 hours to 5-1/2 hours of run time with this computer battery when new, depending on your energy use. This battery replaces the HP ProBook 4210s 4310s 4311s series laptop batteries and a host more which are listed at the extreme bottom of this web page. Replaces these many HP 4210s 4310s 4311s laptop battery part numbers:530974-251 530974-261 530974-321 530974-361 530975-341 530975-361 579320-001 AT902AA HH04 HH04037 HH08 HSTNN-DB91 HSTNN-DB92 HSTNN-I69C-3 HSTNN-OB91 HSTNN-OB92 HSTNN-XB91 HSTNN-XB92 NBP4A165 NBP4A165B1 NBP8A166 NBP8A166B1 Laptop Battery Express only deals with brand new premium computer batteries. We never carry recycled or used batteries. We only use the highest quality cells inside the battery pack so you will have a long service life (300-500 recharge cycles) . We do not use cheaper battery cells which can wear out in a little as 6 months. Our inventory turns rapidly and you will always receive a freshly manufactured battery.