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Makita BL1840B-2 18V LXT Lithium-Ion 4.0Ah Battery Twin Pack, Black

4.7 4.7 out of 5 stars 429 ratings

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Purchase options and add-ons

Number of Batteries 2 Lithium Ion batteries required. (included)
Brand Makita
Battery Cell Composition Lithium Ion
Compatible Phone Models battery

About this item

  • Integrated L.E.D. battery charge level indicator allows user to monitor battery charge
  • 18V LXT Lithium-Ion 4.0Ah battery BL1840B provides up to 35% more run time per charge compared to BL1830
  • 18V LXT Lithium-Ion 4.0Ah battery BL1840B reaches full charge in 40 minutes or less
  • 18V LXT Lithium-Ion 4.0Ah battery BL1840B is compatible with 18V LXT Tools
  • Compatible only with Star Protection tools, indicated by the Star Symbol and/or Yellow Battery Receiver under the tool
See more product details

Customer ratings by feature

Battery life
4.7 4.7
Longevity
4.4 4.4
Value for money
4.2 4.2

Frequently bought together

$121.89 ($60.95/Count)
Get it Mar 22 - 27
In Stock
Ships from and sold by MKIU.
+
Get it as soon as Sunday, Mar 24
In Stock
Ships from and sold by Amazon.com.
+
$118.99
Get it as soon as Monday, Mar 25
Only 1 left in stock - order soon.
Sold by JBTools and ships from Amazon Fulfillment.
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This Item
Makita BL1840B-2 18V LXT Lithium-Ion 4.0Ah Battery Twin Pack, Black
Makita BL1840B-2 18V LXT Lithium-Ion 4.0Ah Battery Twin Pack, Black
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Makita BL1830B 18V LXT Lithium-Ion 3.0Ah Battery, Black
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Price-12% $132.50
Typical:$149.88
-13% $67.00
Typical:$77.20
$56.99$64.88-22% $69.99
Typical:$89.99
-52% $71.21
List:$148.00
Delivery
Get it Mar 22 - 26
Get it Mar 26 - 27
Get it as soon as Sunday, Mar 24
Get it as soon as Sunday, Mar 24
Get it as soon as Sunday, Mar 24
Get it as soon as Sunday, Mar 24
Customer Ratings
Battery life
4.7
3.9
4.5
3.7
3.5
4.5
Longevity
4.4
3.8
4.8
3.6
3.3
4.5
Value for money
4.2
3.5
4.2
4.0
3.8
4.3
Sold By
MORE SAND, INC
Angelville Trading Company
OHYES BAT-US
CHAUNVEN
FUNFUN HOME
HAPPY TOOL
capacity
4 amp hours
4 amp hours
6 amp hours
6000 milliampere hour
6000 milliamp hours
3 amp hours
battery quantity
2 lithium ion
1 lithium ion
2 lithium ion
2 lithium ion
2 lithium ion
1 lithium ion
voltage
18 volts
18 volts
18 volts
18 volts
18 volts
18 volts
reusability
Rechargeable
Rechargeable
Rechargeable
Rechargeable
compatible devices
battery
Solar
Solar
makita 18v power tools
Replace for Makita 18V Battery BL1860B, BL1860B BL1860 BL1850 BL1845 BL1840 BL1830, Replace for Makita 18V Battery BL1840B, Replace for Makita 18V Batteries BL1850B
Remotes

From the manufacturer

dual;two;replacement batteries;electric drill;saw battery

Makita BL1840B-2 18V LXT Lithium-Ion 4.0Ah Battery, 2/pk

LXT batteries
Features
  • Impact-resistant outer case and shock-absorbing inner-liner are engineered to protect the battery
  • Sixteen contact terminals maintain a constant connection with the tool to help prevent power loss or fluctuation, even during high-vibration applications

Makita BL1840B-2 18V LXT Lithium-Ion 4.0Ah Battery, 2/pk

Category-Leading Charge Time

The Makita 18V LXT Lithium-Ion battery charges faster and works longer than standard lithium-ion batteries, giving you and your cordless tools unmatched performance and productivity to take on the most demanding applications. The Makita 4.0Ah battery, model BL1840B, combines more run time (35% more run time per charge than the Makita BL1830 battery) with a category-leading charge time of only 40 minutes so it spends more time working and less time sitting on the charger.

  • For added convenience, it also features an on-board L.E.D. charge level indicator to monitor battery charge.
  • The 18V LXT 4.0Ah battery is compatible only with Star Protection tools, indicated by the Star Symbol and/or Yellow Battery Receiver under the tool.
  • Battery resists self-discharge and remains ready for use even after long periods of storage

Key Features

efficient quick easy connection multiple

stand hold upright simple change charger hooks

light bright see clear shows indication

time show reault tool motor mechanishm series

use genuine makita lithium-ion battereis knock-off caution hazards non-genuine damage fire unknown
one system use same batteries charger tools 18V 36V X2 LXT Cordless power operation

Looking for specific info?

Product Description

The Makita 18V LXT Lithium-Ion battery charges faster and works longer than standard lithium-ion batteries, giving you and your cordless tools unmatched performance and productivity to take on the most demanding applications. The Makita 4.0 Ah battery combines more run time (35% more run time per charge than the Makita BL1830 battery) with a category-leading charge time of only 40 minutes, so it spends more time working and less time sitting on the charger. For added convenience, it also features an L.E.D. charge level indicator to monitor battery charge. The 18V LXT 4.0Ah battery (BL1840) is compatible only with Star Protection tools, indicated by the Star Symbol and/or Yellow Battery Receiver under the tool. Makita 18V Lithium-Ion batteries resist self-discharge so they're ready for use even after long periods of storage. The Makita Rapid Optimum Charger (sold separately) is a smart-charging system that communicates with the battery during the charging process to monitor current, voltage and temperature. This advanced charging technology helps optimize battery life and deliver a faster charge. In addition, the Charger has a built-in fan to cool the battery for faster and more efficient charging, even in hot weather conditions. For improved tool performance and extended battery life, Makita created STAR Protection Computer Controls. STAR Protection is communication technology that allows the tool and battery to exchange data in real time and monitor conditions during use to protect against overloading, over-discharging and overheating. Makita, the innovation leader in cordless tool technology, has the world's cordless tool line-up powered by an 18V lithium-ion slide-style battery.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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Makita BL1840B-2 18V LXT Lithium-Ion 4.0Ah Battery Twin Pack, Black


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Important information

Bulb Voltage

18 volts

Customer reviews

4.7 out of 5 stars
4.7 out of 5
429 global ratings

Customers say

Customers like the battery of the tools, mentioning it has long-lasting power. They like the value of the product, saying it is a great buy. They also appreciate the performance, saying the tool works great and has an inbuilt power indicator.

AI-generated from the text of customer reviews

26 customers mention26 positive0 negative

Customers are satisfied with the battery of the tools. They mention that it is a good strong battery that lasts a long time. Customers are also impressed with the value for money, saying that the batteries are reliable and serve well.

"...They charge very fast and last long enough to charge up the other one (depending on the device you are powering.)..." Read more

"Good quality battery keeps your drll going a long time!" Read more

"...These are great batteries, but are a little pricey. Great product and I would highly recommend these as replacements!" Read more

"I only had the small battery that came with my Makita. These last so much longer than the little 1 Ah that came with my drill...." Read more

23 customers mention20 positive3 negative

Customers like the value of the tools. They say it's expensive, but worth it and a great buy.

"Great value for the money" Read more

"Great value for the price" Read more

"...I was excited to find these at a good price and kept looking for the "catch", but the product and seller had good reviews and seemed to be..." Read more

"Great bang for buck.....reliable batts that stay up long and serve well. As it stands the whole LXT line is tried and proven in by book...." Read more

10 customers mention10 positive0 negative

Customers are satisfied with the performance of the tool. They appreciate the inbuilt power indicator, battery charge indicator, and status indicator.

"...I like the inbuilt power indicator which my old ones do not have...." Read more

"...The status indicator was a nice bonus." Read more

"Great bang for buck.....reliable batts that stay up long and serve well. As it stands the whole LXT line is tried and proven in by book...." Read more

"It worked great and the price was right. Had I bought it straight from the dealer I would have paid a lot more!!!" Read more

3 customers mention0 positive3 negative

Customers have negative opinions about the fit of the tools. They mention that the emblem under the base does not fit.

"...The saw didn’t have the star emblem under the base, so these didn’t fit........or did they?..." Read more

"...These batteries fit in the drill and the impact driver, but DID NOT FIT in the sawzall nor the circular saw...." Read more

"...Other original batteries fit all my tools. These do not fit the jig saw, circular saw, grinder... I can't see why." Read more

Strong and charge very fast
5 Stars
Strong and charge very fast
I use everyday and 4.0 battery i use for all day and charger so fast 15 to 20 minutes
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Top reviews from the United States

Reviewed in the United States on May 19, 2017
4 people found this helpful
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Reviewed in the United States on May 13, 2020
4 people found this helpful
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Reviewed in the United States on July 12, 2021
Reviewed in the United States on September 6, 2019
Reviewed in the United States on February 14, 2023
One person found this helpful
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Top reviews from other countries

Timothy Brake
3.0 out of 5 stars As ordered but slow.
Reviewed in Canada on August 30, 2020
Louis Pearson
4.0 out of 5 stars Would reccommend!
Reviewed in Canada on September 20, 2019
YukonKlondiker
5.0 out of 5 stars Great product
Reviewed in Canada on June 16, 2019