LENOGE Samsung Cell Laptop battery for HP Compaq 510 550 511 610 Series 6720s 6720 6735s 6730s 6730 6735s 6820s 6830s 456864-001 GJ655AA HSTNN-IB51 HSTNN-IB52 HSTNN-XB51 HSTNN-XB52 18 Months Warranty High speed charging Output overcurrent protection Temperature protection Output overvoltage protection Current protection Hardware overcurrent protection Current overcharge protection Fast charge Low power comsuption Real Capacity More than 500 times Recycle Long life runtime Premium Components Impact tested Vibration tested Extreme Temp Tested -40to 150F Lenoge Brand with 24 x 7 email support Perfect Interface Persistent Durable Hp 6720s battery Product instruction