Which lasts longer per charge, the Kastar or the Fanshara?

On paper the Fanshara, at a claimed 7000 mAh versus 2800 mAh for the Kastar. The Kastar is the only one that states a run time, 40 minutes fade-free. Treat the Fanshara figure as a claim until you test it in your own V8.

Is the Fanshara worth saving $14 over the Kastar?

If price is the priority, yes: $25.99 at eBay versus $39.99 at Walmart as of November 5, 2026. The Kastar's advantage is its stated 12-month warranty. If you want recourse if the pack fails, the Kastar is the safer buy.

Will either battery fit my Dyson V8 Absolute?

Both list V8 Animal, Absolute and Fluffy compatibility at 21.6V. Fit depends on the connector shape, wire arrangement and polarity, so compare those with your old pack before ordering. A matching model name alone does not confirm a fit.

Do these work with the original Dyson charger?

The Fanshara listing says it works with the original wall charger. The Kastar listing does not say, but a 21.6V V8 replacement is normally charged on the stock dock. Charge times will be longer on the larger Fanshara pack.

Which has better buyer feedback?

Both sit at 4.4 of 5. The Fanshara has 111 ratings against 25 for the Kastar, so its score rests on more buyers. Neither figure comes from a lab test.

Are these genuine Dyson batteries?

No. Both are third-party replacements from Kastar and Fanshara, not Dyson parts. That is why they cost far less than a Dyson-branded V8 pack.

Kastar Battery Replacement for Dyson V8 Animal, Cordless Stick Vacuum, V8 Fluffy, V8 Absolute vs Fanshara Replacement Battery for Dyson V8

Buy the Fanshara if you want the lowest price and the longest claimed runtime: it is $25.99 at eBay as of November 5, 2026, versus $39.99 at Walmart for the Kastar. Buy the Kastar if you prefer a stated 12-month warranty and a 2800 mAh pack that matches the original Dyson V8 capacity. Both are third-party replacements, so check the connector and part number against your old battery before ordering.

Today the Fanshara Replacement Battery for Dyson V8 costs $15.00 less at its best price.

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