Amazon.com: ARyee 22.2V 4.0Ah DC35 Battery Replacement for Dyson DC31 DC31DC34 DC44 Animal 917083-01 17083-2811 18172-01-04 17083-4211 Handheld Vacuum (Only Fit for Type A, Not fit All Type B Model, DC44 MK2) :
Support | Dyson DC25 upright vacuum | Dyson
Dyson DC35 motor disassembly - back cover remove - YouTube