Kastar Dyson V8 Replacement Battery vs Dinosoo Replacement Dyson V7 Battery

These are not interchangeable. The Kastar pack fits Dyson V8 models; the Dinosoo pack fits V7 models. Buy the one that matches your vacuum, because the connector and housing differ between generations. The Dinosoo has the higher capacity on paper (7000mAh versus 2800mAh) and a slightly higher owner rating, but that figure is a claimed cell rating, and real runtime gains over a genuine V7 pack are smaller than the number suggests. The Kastar is a plain 2800mAh V8 replacement with a one-year warranty and a modest rating from few buyers.

• Choose the Kastar if you own a Dyson V8 (Animal, Fluffy, Absolute or standard) and want a straightforward replacement pack with a stated one-year warranty.
• Choose the Dinosoo if you own a Dyson V7 and want the longest claimed runtime, and you accept that the 7000mAh figure is a marketing rating rather than a guaranteed run time.