Battery2go Ni-MH BATTERY Pack Fits HP 291966-B21, 321496-001, 361011R-291, 274779-001, 347954-B21, 307132-001 Capacity: 500mAh Type: Ni-MH Volts: 3.6V Size : 77.80 x 38.25 x 12.07mm Certificated with ISO9001, RoHS & CE;