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SHINTYOOL

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

  • Based on 930 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Wednesday, Aug 26
Order within 6 hours and 50 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: Wednesday, Aug 26

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.

  • Klarna Financing
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  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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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
    • Good as the OEM battery!
Size: 4.0 AH
A perfect and cost effective battery replacement for my Black & Decker hedge trimmer. Fit perfectly, charged quickly and had a solid 45 minutes usage time.
Reviewed in the United States on May 23, 2026 by Dennis M. Yohe
    • Quality
Size: 4.0 AH
Works well
Reviewed in the United States on July 11, 2026 by Mehrdad panjehali
    • It is a good battery.
Size: 4.0 AH
It seems strong. Have only used once and worked well. Little expensive.
Reviewed in the United States on May 20, 2026 by g h
    • Lithium Battery
Size: 4.0 AH
Perfect replacement and works well with my yard blower.
Reviewed in the United States on July 15, 2026 by Haveagoodtime
    • Battery with good run time
Size: 4.0 AH
So far this battery has a good run time for my leaf blower. Yet to have it run out of power before I get decks and patio clear of leaves and debris
Reviewed in the United States on July 16, 2026 by Amazon Customer
    • Battery Caught FIRE
Size: 4.0 AH
Review Image by Caleb Eckenrode
Battery EXPLODED out the side and then caught fire after using it on my impact to loosen up a tight bolt. Did work perfectly for a few months though
Reviewed in the United States on July 30, 2026 by Caleb Eckenrode
    • works great
Size: 4.0 AH
this battery works great on my elecxstric weed eater.
Reviewed in the United States on August 1, 2026 by Benny L Lewis

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