Capacity: 2500mAh(High capacity,Longer runtime,can use more longer lifetime than 2.0Ah). Replace dyson battery Type: Li-ion Voltage: 22.2V Please check the connecter of your original dyson battery. It's type A, not type B. Tthis replacement Battery for Dyson DC44 DC31 DC34 DC35 type A (except DC 31 DC 34 DC 35 DC 44 TYPE B), With FCC, CE and RoHS certified, the replacement dc35 dc34 dc31 dc44 battery 100% compatible with the original dyson vacuum and may exceed the performance of OEM products. Support Fast Charge. Hold a charge longer than the Dyson OEM battery type A.No memory effect. Can be charged or discharged as needed without loss of capacity. Flylinktech batteries for dyson provide 1 year warranty,30 days money back.and friendly customer service.