StoreDeal.ai store
Shop
  • Deals
  • Deal checker
  • Black Friday
  • Buying guides
  • Brands
  • Stores
Travel
  • Flight deals
  • Hotel deals
Company
  • Research
  • Press
  • Use in AI assistants
  • Contact
  • deal.ai apps
Black Friday 2026
  • Walmart
  • Best Buy
  • Target
  • TVs
  • Laptops
  • Headphones
  • Apple
  • Gaming
  • Vacuums
  • Kitchen
  • Toys
  • Smartwatches
  • Tablets
  • Furniture
  • Mattresses
© Deal.ai Inc.·2222 Ponce de Leon Blvd, Miami, FL 33134·support@deal.ai
TermsPrivacy
Deal.ai › Makita
Makita
Makita BL1840B 18V LXT 4.0Ah Lithium-Ion Battery with Fuel Gauge

Makita BL1840B 18V LXT 4.0Ah Lithium-Ion Battery with Fuel Gauge

Best price now

$70.00at Power Homes ProChecked 11 h ago

29% under what the other stores charge

Compared across 10 stores. Prices are checked against each store and labelled with when.

Visit Power Homes Pro

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Enter to send, Shift+Enter for a new line

Price facts

  • Lowest price today: $70.00 at Power Homes Pro (checked Nov 15, 2026).
  • Checked at 10 stores.

Our take on the Makita BL1840B 18V LXT 4.0Ah Lithium-Ion Battery with Fuel Gauge

The Makita BL1840B is a 4.0Ah 18V LXT lithium-ion pack with a built-in four-stage LED fuel gauge. It fits Makita 18V LXT tools that carry the Star Protection star symbol or a yellow battery receiver. It is the mid-capacity pack in the LXT line: more runtime than a 3.0Ah pack, less than a 5.0Ah, and lighter than the larger packs. Owners like the charge gauge and the steady power; the main complaints are that it is sold as a bare battery and that the 4.0Ah pack runs down faster than the 5.0Ah in heavy cutting and drilling.

Best forOwners of Makita 18V LXT tools who need a spare or replacement packTrade users who want a lighter pack than a 5.0Ah for overhead workShoppers who want a charge gauge on the battery itself
Pros
  • Onboard LED fuel gauge shows charge at a glance
  • 4.0Ah capacity gives longer runtime than 3.0Ah packs
  • Lighter and smaller than 5.0Ah packs
  • Works with the wide Makita 18V LXT tool range
  • Star Protection circuitry for compatible tools
Cons
  • Battery only; no charger or tools included
  • Less runtime than a 5.0Ah pack in heavy use
  • No original retail box
  • Not for tools without the star symbol or yellow receiver

Makita BL1840B 18V LXT 4.0Ah Lithium-Ion Battery with Fuel Gauge prices at every store

  • Power Homes ProNew

    In stockReturn policy

    $70.00Checked 11 h ago
    Visit Power Homes Pro
  • NS LiquidationsNew

    In stock

    $84.00Checked 11 h ago
    Visit NS Liquidations
  • eibmarkt.comNew

    In stock

    $93.43+ $41.80 shippingChecked 11 h ago
    Visit eibmarkt.com
  • eibabo.comNew

    In stock

    $98.42+ $43.59 shippingChecked 11 h ago
    Visit eibabo.com
  • Tool AcademyNew

    In stock

    $110.26+ $40.00 shippingChecked 11 h ago
    Visit Tool Academy
  • WhatnotNew

    In stock

    $159.00Checked 11 h ago
    Visit Whatnot
  • eBayNew

    In stockSold by datorpro

    $299.99Free shippingChecked 11 h ago
    Visit eBay
  • AmazonNew

    Availability unknown

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

    $79.99Free shippingChecked 11 h ago
    Visit Amazon
  • WalmartNew

    Out of stockSold by Mass Depot LLC

    $85.94Free shippingChecked 11 h ago
    Visit Walmart
  • MassdepotNew

    Out of stock

    $85.94Free shippingChecked 11 h ago
    Visit Massdepot

Store links may earn us a commission.

Makita BL1840B 18V LXT 4.0Ah Lithium-Ion Battery with Fuel Gauge price history

Lowest price we've seen: $79.99 on Nov 15 at Amazon. Tracked across 9 stores since Nov 15.

What reviewers say

Owners of Makita LXT tools rate the BL1840B as a reliable mid-size pack with a useful charge gauge. Most praise its steady power and fit; some say it drains faster than a 5.0Ah in demanding tools.

What people mention
  • Fuel gaugePraisedOwners like the LED indicator for checking charge without a tool.
  • RuntimeMixedFine for most jobs, but heavy cutting and drilling drain it faster than a 5.0Ah.
  • FitPraisedSlides into LXT tools and chargers cleanly with no play.
  • WeightPraisedLighter than larger packs, which helps in overhead work.
  • PackagingCriticisedSome buyers note it arrives without the original retail box.

About the Makita BL1840B 18V LXT 4.0Ah Lithium-Ion Battery with Fuel Gauge

The Makita BL1840B is an 18V LXT lithium-ion battery with a 4.0Ah capacity. It has an onboard LED charge indicator that shows the remaining charge.

It works with compatible Makita LXT Star Protection tools, which carry a star symbol and/or have a yellow battery receiver.

Model
BL1840B
Brand
Makita
Voltage
18V
Capacity
4.0Ah
Battery type
Lithium-ion
Battery line
LXT
Charge indicator
Onboard LED
Compatibility
Makita LXT Star Protection tools with a star symbol and/or yellow battery receiver
In the box
1 battery only; tools and charger not included
Condition
Brand new, without the original retail box

Questions and answers

Which Makita tools does this battery fit?
It fits Makita 18V LXT tools that have the Star Protection star symbol or a yellow battery receiver. Tools without those markings are not compatible.
Is a charger included?
No. The box contains one battery only. Tools and charger are sold separately.
How does it compare with the 5.0Ah pack?
It is lighter and smaller but gives less runtime. The 5.0Ah pack suits heavy cutting and drilling; this one suits lighter or overhead work.
Does it have a charge indicator?
Yes. An onboard LED fuel gauge shows the charge level at the press of a button.
Can I use it with older Makita 18V tools?
Only if the tool has the star symbol or yellow battery receiver. Older LXT tools without those markings are not listed as compatible.
Where is the Makita BL1840B 18V LXT 4.0Ah Lithium-Ion Battery with Fuel Gauge cheapest?
At Power Homes Pro, for $70.00, 29% under what the other stores charge, as of our latest check.
Where can I buy the Makita BL1840B 18V LXT 4.0Ah Lithium-Ion Battery with Fuel Gauge?
10 stores we checked sell it, including Power Homes Pro, Amazon, NS Liquidations, Walmart, Massdepot.

Stores we've priced the Makita BL1840B 18V LXT 4.0Ah Lithium-Ion Battery with Fuel Gauge at

  • Tool Academy deals and prices
  • Walmart deals and prices
  • Whatnot deals and prices

More from Makita

  • M
    Makita BL1820B 18V LXT Lithium-Ion Tool Battery - Pack of 3
    Makita BL1820B 18V LXT Lithium-Ion Tool Battery - Pack of 3
  • M
    Makita BL1830B 2-pack
Makita BL1830B 2-pack
  • M
    Makita Power Tools Mugs
    Makita Power Tools Mugs
  • M
    Makita BL1850B-2 2-Pack
    Makita BL1850B-2 2-Pack
  • M
    Makita Lithium-Ion Battery, 18V, 5.0Ah – BL1850B
    Makita Lithium-Ion Battery, 18V, 5.0Ah – BL1850B
  • M
    Makita BL1850
    Makita BL1850
  • M
    Makita BL1840B
    Makita BL1840B
  • M
    Makita 18V Li-Ion LXT Battery 2PK
    Makita 18V Li-Ion LXT Battery 2PK
  • All Makita deals and products →

    More power tool batteries

    • M
      Makita ADBL1840B Outdoor Adventure 18V LXT 4Ah Battery
      Makita ADBL1840B Outdoor Adventure 18V LXT 4Ah Battery
    • M
      Makita BL1830B 18V LXT 3.0 Ah Li-ion Battery
      Makita BL1830B 18V LXT 3.0 Ah Li-ion Battery
    • M
      Makita BL1840B 2-pack
      Makita BL1840B 2-pack
    • M
      Makita 18V Lithium-Ion 5.0Ah Battery
      Makita 18V Lithium-Ion 5.0Ah Battery
    • M
      Makita 18V LXT Battery 3.0Ah | BL1830B
      Makita 18V LXT Battery 3.0Ah | BL1830B
    • M
      Makita BL1850B 18v LXT 5.0Ah Lithium-Ion Battery
      Makita BL1850B 18v LXT 5.0Ah Lithium-Ion Battery
    • M
      Makita 18V LXT Li-Ion Tool Battery - Pack of 12 Bulk Household Pack
      Makita 18V LXT Li-Ion Tool Battery - Pack of 12 Bulk Household Pack
    • M
      Makita BL1021BDC1 12V Max CXT Lithium-Ion Battery and Charger Starter Pack
      Makita BL1021BDC1 12V Max CXT Lithium-Ion Battery and Charger Starter Pack