Dyson DC31 DC34 DC35 DC44 battery disassembly for replacement: Not Worth It. - YouTube
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YABER Dyson DC34 DC35 4500mAh Replacement Battery for Type B Dyson DC31 DC34 DC35 DC44 DC45 (Not for Type A, Only Fit for Type B Screw-fixing): Amazon.co.uk: Home & Kitchen