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SHINTYOOL

21v Lithium Battery - 4.0 Ah Battery with Charger Adapter Led Indicator Compatible with Leaf Blower

  • Based on 965 reviews
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Availability: In Stock.
Fulfilled by Amazon
Arrives Monday, Oct 12
Order within 8 hours and 17 minutes
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Size: 4.0 AH


Features

  • Compatible with More Our batteries are compatible with some major brands, for power tools bl1860b bl1850 bl1840 bl1850b-2 bl1845 bl1830 bl1820 bl1815 lxt-400 series please feel free to contact us for more model information.
  • 21 Volt Lithium Battery Battery voltage: 21v, capacity: 4000ah, type: lithium ion, made of 10 pcs quality lithium ion battery,can provide stable capacity and output.
  • ChargerSupport 100-240v universal standard ac input voltage.1a power adapter,us plug,led indicator to easily see the charging situation.
  • Multi-Protect Safety SystemThis battery is equipped with overload protection, overheat protection & over-discharge protection.
  • Note on BatteryIn order to protect the battery, please do not charge more than 6 hours.Note: Please Fully charge the battery before its first use. Please do not charge the battery for overnight since it will badly damage the battery life.
  • WEVE GOT YOU COVERED Any Non-human Damage Or Any Reason You Are Not Completely Satisfied With Our Product, We Will Immediately Provide You A Full Refund ( Or Replace Your Item).

Description

A Great Gift Idea For Dad, Mom, Husband, Friends And Family, Suitable For Everyone Who Needs It, Whether You Are A Professional Or An Average Person. Any Non-human Damage Or Any Reason You Are Not Completely Satisfied With Our Product, We Will Immediately Provide You Replace Your Item. How to install battery Note： 1. Do not try to open the battery. 2. Protect the battery against continuous intense sunlight, fire, water, and moisture. 3. Do not damage the battery with sharp objects. 4. Do not discard this product at will. 5. Overcharging the device will reduce the life of the battery, unplug it from the charger in time to avoid overcharging. 6. If the battery does not last 10 minutes, it may be caused by overheating. Please wait for 5 minutes for the battery to cool down. Battery Maintenance:

Number of Batteries: 1 Lithium Ion batteries required.


Brand: SHINTYOOL


Battery Cell Composition: Lithium


Battery Capacity: 4 amp_hours


Recommended Uses For Product: Power Tool


Number of Batteries: 1 Lithium Ion batteries required.


Brand: SHINTYOOL


Model Number: 4.0AH


Model Name: 4.0ah Li-ion Battery


Manufacturer: SHINTYOOL


Warranty Description: 1 yera


Battery Cell Type: Lithium


Battery Capacity: 4 amp_hours


Voltage: 21


Reusability: Rechargeable


Amperage: 1 A


Compatible Phone Models: For ALLOYMAN, Aoben, seesill, EWORK, Inquire to learn more about compatible brands.


Unit Count: 1 Count


Battery Weight: 1.3 pounds


Item Weight: 9 ounces


Antenna Location: Power Tool


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Oct 12

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

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Top Amazon Reviews

    • SHINTYOOL 21v 4.0 Ah Battery: A Perfect, Powerful Replacement for Off-Brand Tools!
Size: 4.0 AH
I received the SHINTYOOL 21v Lithium Battery with Charger Adapter (4.0 Ah), and I am genuinely impressed. I took a chance hoping this would be a compatible solution for my slightly older, off-brand 21v cordless leaf blower—and it was a perfect fit! Finding reliable battery replacements for generic or lesser-known tool brands can be a nightmare, but this SHINTYOOL battery snapped into place smoothly, instantly reviving my leaf blower. The 4.0 Ah capacity is a significant upgrade over my original battery, providing a noticeable increase in run time. I was able to clear my entire yard without needing a recharge, which was never possible before. The accompanying charger works quickly and efficiently, and the built-in LED indicator on the battery itself is incredibly useful for quickly gauging the remaining charge without having to plug it into the tool or charger. This battery delivers consistent, strong performance and proves you don't always need to buy the expensive OEM part for quality power. If you have an off-brand 21v tool, give this battery a try—it's a high-quality, high-capacity solution. Pros: Perfect fit and compatibility with generic 21v tools. 4.0 Ah capacity delivers excellent, long-lasting run time. Reliable and fast charging. Clear LED indicator for checking battery life. ... show more
Reviewed in the United States on October 6, 2025 by Richard Fletcher
    • Love!!
Size: 4.0 AH
Fit perfect and charges well… my old one got left out side ( carelessness from someone else other than me ) it got weathered and couldn’t home its charge. This was the replacement for it and I am very grateful!!
Reviewed in the United States on August 31, 2026 by Elizabeth Walls
    • Do not charge over 3 hours at a time.
Size: 4.0 AH
It works great.
Reviewed in the United States on September 1, 2026 by This product was extremely disappointing. There are not what I was expecting I have purchased this item elsewhere and there is no comparison!
    • Reasonable value and ready with a backup battery and charger
Size: 4.0 AH
Ordered to have a backup battery ready when we need to use a battery operated snow shovel we recently bought. Received and immediately fully charged the battery. We took up to our cabin to run it but the snow had melted. So we just ran it without actually using it for about 15 minutes and this was good. We will update if we experience any issues. The charger worked as it should as well. So we are set for the next snow storm. Might not be until next winter-but we are prepared now. This will also work on other items like leaf blowers and small garden equipment. ... show more
Reviewed in the United States on March 31, 2026 by Cat’s Review
    • They do work with my weeder
Size: 4.0 AH
was worried that the batteries would not work with the equipment I own, but with a return policy and a closeup of the connections, I was pretty sure it would fit. They did. a good value for a fast draining battery. easy to use, but the cattery charge time is a little longer than I expected.
Reviewed in the United States on August 1, 2025 by E. Decker
    • Useful tool
Size: 4.0 AH
Good product
Reviewed in the United States on August 18, 2026 by Christian Seider
    • Works great
Size: 4.0 AH
Working well using it in backpack sprayer holds a change for days.
Reviewed in the United States on September 9, 2026 by Amazon Customer
    • Good Value
Size: 4.0 AH
Fit my off-brand leaf blower after others would not. 1 star withheld because it's only 4Ah so won't run when fully charged as long as a 6-8Ah ones. Fairly fast delivery right to my front porch. Hopefully it will last longer than my previous one that was only providing 2-3 minutes of run time after a full charge procedure After using for less than a year. Reasonable price with a charger included. ... show more
Reviewed in the United States on April 20, 2026 by DB

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