wow...been using the battery a few months and it seems perfect, no issues to report at all... Slotted into hand held Dyson perfectly and fits charger perfectly, charging in an appropriate time...Has given a new lease of life to our hand held which cost a fortune but seemed destined for the bin. This replacement battery cost so much less than a dysom own brand! Am so annoyed with myself for hesitating for a few months over buying a non Dyson battery. Would recommend this product to anyone else who is hesitating. So far is fantastic, like having a new machine.