If you have Dyson cordless model V7 or V8, it is well worth repairing rather than replacing. 

V8 is still a current model sold by Dyson. V7 has only recently been discontinued.

Battery capacity can reduce over time, so if your V7 or V8 no longer runs for around 6 minutes when on MAX mode, it probably needs a replacement battery.

If your V7 or V8 still runs for around 6 minutes on MAX mode, but just isn't performing very well, then a service should get your machine working 100% again.

I can service your Dyson V7 or V8 cordless vacuum in the following local areas:

Alderley Edge, Alsager, Biddulph, Congleton, Crewe, Holmes Chapel, Knutsford, Macclesfield, Middlewich, Nantwich, Newcastle-Under-Lyme, Northwich, Sandbach, Stoke-On-Trent, Wilmslow, Winsford.