Dyson DC35 motor disassembly - back cover remove - YouTube
Powtree 2PACK 22.2V 2200mAh Li ion Vacuum Battery For Dyson DC31 DC31A DC44 (Fit Type A) DC31 A Animal Exclusive Dyson DC34 DC44|Replacement Batteries| - AliExpress
Type A 22.2V 3500mAh Lithium Replacement Battery for Dyson DC44 DC31 DC34 DC35 MK2 Cordless Vacuum Battery Only Fit Type B/DC34|Replacement Batteries| - AliExpress