Modern lithium Ion rechargeable batteries don't slow down as they discharge, they run full appliance and then just boom they are dead. You need a new battery
Unfortunately the DC05's Motorhead is supplied as a complete assembly, so we're unable to offer individual components to repair your Motorhead. If you'd like to order a replacement Motorhead assembly, you can do so via our Helpline on 0800 298 0298, or through our online store:
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