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Deal.ai › Makita
Makita
18V LXT LITHIUM-ION 4.0AH BATTERY
Makita

18V LXT LITHIUM-ION 4.0AH BATTERY

Best price now

$69.00at MassdepotChecked 7 h ago

37% under what the other stores charge

Compared across 12 stores. Prices are checked against each store and labelled with when.

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Price facts

  • Lowest price today: $69.00 at Massdepot (checked Nov 15, 2026).
  • Checked at 12 stores.

Our take on the 18V LXT LITHIUM-ION 4.0AH BATTERY

The Makita BL1840 is a 18V LXT Lithium-Ion battery with 4.0Ah capacity, offering up to 35% more run time per charge than the 3.0Ah BL1830. It charges in 40 minutes with a Rapid Optimum Charger and has a built-in LED charge level indicator. It works only with Makita tools that have the Star Protection symbol. Owners like the extra run time and fast charging, but some wish it had a fuel gauge and note it is heavier than smaller packs.

Best forMakita 18V LXT tool owners needing longer run timeProfessionals who want fast chargingUsers with Star Protection tools
Pros
  • Up to 35% more run time than the BL1830
  • Charges in 40 minutes with a Rapid Optimum Charger
  • LED charge level indicator shows battery status
  • Resists self-discharge for storage
  • Communicates with charger for efficient charging
Cons
  • Only compatible with Star Protection tools
  • Heavier than smaller capacity batteries
  • No fuel gauge on the battery itself

18V LXT LITHIUM-ION 4.0AH BATTERY prices at every store

  • BC Decorative Concrete SupplyNew

    In stockReturn policy

    $127.50Checked 7 h ago
    Visit BC Decorative Concrete Supply
  • Leeper HardwareNew

    In stockReturn policy

    $132.99Checked 7 h ago
    Visit Leeper Hardware
  • eibabo.comNew

    In stock

    $98.42+ $43.59 shippingChecked 7 h ago
    Visit eibabo.com
  • WhatnotNew

    In stock

    $135.00+ $8.35 shippingChecked 7 h ago
    Visit Whatnot
  • Magnuson LumberNew

    In stockReturn policy

    $159.99Checked 7 h ago
    Visit Magnuson Lumber
  • eBayNew

    In stockSold by datorpro

    $299.99Free shippingChecked 7 h ago
    Visit eBay
  • MassdepotNew

    Availability unknown

    $69.00Checked 7 h ago
    Visit Massdepot
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $79.99Free shippingChecked 7 h ago
    Visit Amazon
  • NS LiquidationsNew

    Availability unknown

    $84.00Checked 7 h ago
    Visit NS Liquidations
  • WalmartNew

    Availability unknownSold by Mass Depot LLC

    $85.94Checked 7 h ago
    Visit Walmart
  • eibmarkt.comNew

    Availability unknownShips from abroad · duties may apply

    $93.43Checked 7 h ago
    Visit eibmarkt.com
  • Tool AcademyNew

    Availability unknown

    $110.26Checked 7 h ago
    Visit Tool Academy

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18V LXT LITHIUM-ION 4.0AH BATTERY price history

Lowest price we've seen: $69.00 on Nov 15 at Massdepot. Tracked across 9 stores since Nov 15.

What reviewers say

Owners appreciate the longer run time and fast charging of the BL1840, often noting it as a reliable upgrade from smaller packs. Some mention the weight and the lack of a built-in fuel gauge as minor drawbacks.

What people mention
  • Run timePraisedReviewers say the 4.0Ah capacity delivers noticeably longer run time than the 3.0Ah BL1830.
  • Charging speedPraisedWith a Rapid Optimum Charger, the battery charges quickly, reducing downtime.
  • WeightMixedSome users find the battery heavier than smaller packs, which can affect tool balance.
  • CompatibilityMixedIt only works with Star Protection tools, so owners of older Makita tools may not be able to use it.
  • Fuel gaugeCriticisedA few reviewers wish the battery had a built-in fuel gauge like some other Makita models.

About the 18V LXT LITHIUM-ION 4.0AH BATTERY

The Makita 18V LXT Lithium-Ion 4.0Ah Battery (BL1840) provides up to 35% more run time per charge than the BL1830. It charges in 40 minutes. A built-in LED charge level indicator shows the battery status at a glance.

The battery is designed to resist self-discharge, so it is ready to use after long periods of storage. When used with the Makita Rapid Optimum Charger (sold separately), it communicates with the charger to monitor current, voltage, and temperature. A built-in cooling fan improves charging performance, even in hot conditions.

STAR Protection Computer Controls allow real-time communication between the tool and battery. This helps prevent overloading, over-discharging, and overheating. The battery works only with Makita STAR Protection tools, which are identified by the Star Symbol and/or a yellow battery receiver under the tool.

Model
BL1840
Voltage
18V
Capacity
4.0Ah
Battery type
Lithium-ion, slide-style
Charge time
40 minutes
Run time
Up to 35% more per charge than the BL1830
Indicator
Built-in LED charge level indicator
Compatibility
Makita STAR Protection tools only (Star Symbol and/or yellow battery receiver under the tool)
Charger
Makita Rapid Optimum Charger, sold separately

Questions and answers

Is this battery compatible with all Makita 18V tools?
No, it only works with Makita 18V LXT tools that have the Star Protection symbol. Check your tool for the star symbol or yellow battery receiver.
How long does it take to charge?
It charges in about 40 minutes with a Makita Rapid Optimum Charger. Charging time may vary with other chargers.
Does it have a charge indicator?
Yes, it has a built-in LED charge level indicator that shows the battery's charge status.
Is this battery worth it over the 3.0Ah version?
If you need longer run time, the 4.0Ah offers up to 35% more run time per charge than the 3.0Ah BL1830, which can reduce downtime.
Can I use this battery with a non-Makita charger?
No, it is designed for Makita chargers, and using a non-Makita charger may be unsafe and void the warranty.
What is included in the box?
The box includes the BL1840 battery only. Charger and tools are sold separately.
Where is the 18V LXT LITHIUM-ION 4.0AH BATTERY cheapest?
At Massdepot, for $69.00, 37% under what the other stores charge, as of our latest check.
Where can I buy the 18V LXT LITHIUM-ION 4.0AH BATTERY?
12 stores we checked sell it, including BC Decorative Concrete Supply, Magnuson Lumber, Leeper Hardware, Massdepot, Amazon.

Stores we've priced the 18V LXT LITHIUM-ION 4.0AH BATTERY at

  • Tool Academy deals and prices
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  • Whatnot deals and prices

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