This battery I use on my Dyson DC34. After charging 1. I min 30 sec duration eyes stopped 7 on maximum power. When now 3 year old original battery it was 5 min 35 sec. Dyson specifies a period of about 7 minutes at maximum power. Is known to increase New rechargeable power after repeated charging to their maximum capacity. Therefore, I expect a Dauersaugleistung about 8 minutes. If it is confirmed, I will write an update to my review. The battery makes a good impression qualititiv and fits exactly in the DC34. Whether you can charge the only separately or in instrument I do not care, since I use any wall mount. The price performance ratio is okay, hopefully confirms that in the future. So far, strong buy recommendation. Oh, before I forget: The battery was within 4 days there, the dispatcher sitting in Frankfurt.