The Best Dyson V7 Replacement Battery? We Tested Four So You Don’t Have To

Hey there, Matt from House of Vacuums here! If you're staring at your Dyson V7 wondering why the battery won’t hold a charge anymore—and you've seen the gasp $96 OEM price tag—you’re not alone. That’s why we put four of Amazon’s best-selling off-brand Dyson V7 batteries to the test, to see which one (if any) is actually worth your money.

This isn’t a sponsored piece—we bought these batteries ourselves at full retail price and ran each one through a stress test on a brand-new Dyson V7. We tested only on high power mode with the carpet nozzle attached to simulate real-world vacuuming. Why high mode? Because it puts more stress on the battery and gives us a clearer picture of performance, durability, and how they handle heat.

The OEM Benchmark: Dyson Original Battery

Run Time: 7 minutes, 25 seconds
Max Temp: 107°F
Price: $96 (when you can find it)

The OEM Dyson battery uses Murata VTC4 cells, which are absolute workhorses, handling up to 30 amps—well above the Dyson’s 16 amp requirement. It’s a solid performer, but often out of stock and always pricey.

1. Kunlun 4.0Ah Replacement Battery

Price: $37
Run Time: 6 minutes, 38 seconds
Max Temp: 111°F

This one had clean build quality and nice nickel strips, but it uses BTW 20PC cells—no-name Chinese cells with sketchy documentation. While technically rated up to 20 amps, the actual capacity was only 2.0Ah, half of the stated 4.0Ah. It works, but there’s some overpromising here.

2. DTK 4.0Ah Replacement Battery

Price: $35
Run Time: 7 minutes, 32 seconds (longest of the group!)
Max Temp: 113°F

Despite the best run time, this one had a major red flag: the cells (Pros 18650F2S) are only rated for 6 amps, way below the 16 amps the Dyson demands. That means these cells are being pushed hard, which could shorten their lifespan or even cause overheating issues over time. Plus, the 4.0Ah label is again misleading—these are just 2.0Ah cells.

3. Kodolate 4.5Ah Replacement Battery

Price: $29 (cheapest of the bunch)
Run Time: 5 minutes, 52 seconds
Max Temp: 113°F

This one looked great internally and used reputable EVE 15P cells, which are rated for up to 30 amps. Sounds great, right? Except the cells are only 1.5Ah, which explains the short run time. It’s a quality pack in terms of components, but it just doesn’t last long enough.

4. PowerExtra 5.0Ah Replacement Battery

Price: $36
Run Time: 7 minutes, 19 seconds
Max Temp: 109°F

The good news? This one uses EVE 25P cells—high discharge (30 amps) and 2.5Ah capacity. That’s more in line with the advertised rating. The downside? The internal construction was a mess: soldered wires instead of welded strips, and an overall look of cost-cutting on the board. It may work fine... but it doesn’t look great.

So... Who Wins?

Well, it’s complicated. None of the batteries are perfect, but two stood out:

🥇 Tie for First Place:

• Kodolate – Great internal build and quality cells, but short run time.

• PowerExtra – Excellent run time and solid cells, but messy build quality.

If I had to pick just one? I’d lean toward the PowerExtra. The run time is too good to pass up, and for $36, I’m okay rolling the dice on the less polished build—especially since it runs cooler than the DTK.

Final Thoughts

OEM is still the safest and most reliable bet if you can find one. But if you’re looking for a quick, cost-effective fix, PowerExtra gives the best performance for the price. Just know what you’re getting into—off-brand batteries are often a mixed bag.

If you found this helpful, check out our battery dissection playlist. And for anything vacuum-related, swing by TheHouseofVacs.com.

See you in the next teardown!
—Matt