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18-Volt LXT Lithium-Ion 4.0Ah Battery
  • Makita
  • Model BL1840B-2
  • Internet #206605904
  • Store SO SKU #

18-Volt LXT Lithium-Ion 4.0Ah Battery

$189.00 /each
Discontinued Model:

Model # BL1840-2

Internet #205579204

Store SO SKU #1001020072

Makita 18-Volt LXT 4.0Ah Lithium-Ion Battery (2-Pack)
0088381430180

Discontinued Makita

18-Volt LXT 4.0Ah Lithium-Ion Battery (2-Pack)

  • Up to 35% more run time compared to the 18-Volt 3.0Ah battery
  • Charges in 40 minutes or less with Makita Rapid Optimum Charger
  • Compatible only with Star Protection tools

Frequently Bought Together

Product Overview

The Makita 18-Volt 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 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. Makita 18-Volt 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 18-Volt lithium-ion slide-style battery.

California residents: see   Proposition 65 information

  • Provides up to 35% more run time per charge compared to the 18-Volt 3.0Ah battery (BL1830)
  • Reaches a full charge in 40 minutes or less on the Makita rapid optimum charger (sold separately)
  • Battery delivers consistent power and run time in extreme temperatures, even in winter (-4°F/-20°C)
  • Star protection computer controls allow the tool and battery to monitor conditions during use and exchange data in real time to protect against overloading, over-discharging and overheating
  • Makita rapid optimum charger (sold separately) communicates with the battery’s built-in chip throughout the charging process to optimize battery life by actively controlling current, voltage and temperature
  • Impact-resistant outer case and shock-absorbing inner-liner are engineered to protect the battery
  • 16 contact terminals maintain a constant connection with the tool to help prevent power loss or fluctuation, even during high-vibration applications
  • Battery resists self-discharge and remains ready for use even after long periods of storage
  • Compatible with Makita 18-Volt LXT and 18-Volt compact cordless tools with the star symbol
  • Makita 18-Volt lithium-ion is the world’s largest cordless tool line-up powered by an 18-Volt lithium-ion slide-style battery
  • 3-year limited warranty



  • Click here for more information on Electronic Recycling Programs

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Customer Questions & Answers

4 Questions8 Answers

Customer Questions & Answers

18-Volt LXT 4.0Ah Lithium-Ion Battery (2-Pack)
18-Volt LXT 4.0Ah Lithium-Ion Battery (2-Pack)

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3 answers

Does Makita warrant these?

This question is from 18-Volt LXT 4.0Ah Lithium-Ion Battery (2-Pack)
Asked by
Lake Forest, CA
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August 7, 2015
Do these batteries come with a factory warranty from Makita? Also, can I purchase an extended warranty from Home Depot?
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Asked by
Coldwater MI
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January 19, 2016
Answer: 
Yes
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Asked by
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August 10, 2015
Answer: 
I believe they do have a factory warranty.
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Asked by
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August 10, 2015
Answer: 
The Makita 18-Volt LXT 4.0Ah Lithium-Ion Battery 2-Pack (BL1840) comes with a limited one-year manufacturer warranty. Home Depot does not offer an extended warranty on batteries.
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2 answers

Are these batteries compatible with the DC18RC charger

This question is from 18-Volt LXT 4.0Ah Lithium-Ion Battery (2-Pack)
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April 13, 2016
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Asked by
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April 18, 2016
Answer: 
Yes, the Makita 18-Volt LXT 4.0Ah Lithium-Ion Battery (BL1840) is compatible with the 18-Volt Lithium-Ion Rapid Optimum Battery Charger (DC18RC).
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April 14, 2016
Answer: 
Yes, these batteries are compatible with the DC 18RC charger.
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2 answers

when will these be in stock ?

This question is from 18-Volt LXT 4.0Ah Lithium-Ion Battery (2-Pack)
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December 10, 2014
8V LXT Lithium-Ion 4.0 Ah Battery (BL1840)
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Asked by
Coldwater MI
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January 19, 2016
Answer: 
Order the set on line, ship to the store.
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December 11, 2014
Answer: 
Thank you for your recent inquiry with The Home Depot. This item is expected to return to stock in late January 2015 with limited inventory. Please continue to check our website for updates. For any other questions, please call us at HomeDepot.com Customer Service 1-800-430-3376. Thank you for shopping Home Depot.
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1 answer

you get two for the price

This question is from 18-Volt LXT 4.0Ah Lithium-Ion Battery (2-Pack)
Asked by
Tasmania
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February 29, 2016
you get two batterys for the prices how long for delivery
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Answer (1)

May 5, 2016
Answer: 
Thank you for your recent inquiry with The Home Depot, Jack. Delivery for these batteries normally takes 5 - 7 business days. We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot.
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Customer Reviews

Rated 5.0 out of 5 by 6 reviewers.
Rated 5.0 out of 5.0 by Needed power Great power. Use for work. Prompt service. Home Depot has what I need. September 6, 2016
Rated 5.0 out of 5.0 by love my new batteries the new batteries last so much longer it increases work time and productivity and not to forget mental relaxation of having another one charged before the first one dies !!! June 24, 2016
Rated 5.0 out of 5.0 by Batteries I was trying to buy 5amp batteries, however they were not available so I purchased the 4amp ones instead. All my past batteries were 3amp & I never had problems with them until I bought the brushless weed wacker & needed more run time to get around the yard. They get it done!! January 19, 2016
Rated 5.0 out of 5.0 by Why Makita, why? Purchased these batteries for an upgrade from my 3.0 Ah and just my luck, these batteries are not compatible w/ my BHP454 drill. They are, however, compatible w/ my BTD141 impact drill July 26, 2015
Rated 5.0 out of 5.0 by good quality The batteries hold charges for a very long time and easy to load May 12, 2015
Rated 5.0 out of 5.0 by works great! Some reviews online state these may not work with older 18v Makita tools. Thankfully they work in all 7 of mine! A significant difference in run time. If you're running these tools a lot, these batteries will pay for themselves in no time! There's rumor of a 5aH on the horizon..... February 17, 2015
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