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Makita BL1850B 18-Volt LXT Lithium-Ion High Capacity Battery Pack 5.0Ah with Fuel Gauge

Makita BL1850B 18-Volt LXT Lithium-Ion High Capacity Battery Pack 5.0Ah with Fuel Gauge

Best price now

$93.00at AmazonChecked 2 h ago

45% under what the other stores charge

Compared across 8 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. As an Amazon Associate, Deal.ai earns from qualifying purchases.

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Price facts

  • Lowest price today: $93.00 at Amazon (checked Nov 14, 2026).
  • Checked at 8 stores.

Our take on the Makita BL1850B 18-Volt LXT Lithium-Ion High Capacity Battery Pack 5.0Ah with Fuel Gauge

The Makita BL1850B is a 5.0Ah 18-volt LXT lithium-ion battery pack with a built-in four-stage fuel gauge. It is the mid-capacity pack in Makita's LXT line, sitting above the 3.0Ah and below the 6.0Ah options, and it fits any 18V LXT tool with the Star Protection receiver. Makita claims a 45-minute charge time on the Rapid Optimum Charger, which is quick for a pack this size. Owners like the charge time and the fuel gauge; the main complaints are weight and the fact that it needs a compatible charger and Star Protection tool to work as intended.

Best forOwners of Makita 18V LXT tools who want a spare or replacement packUsers who rotate several batteries and want a charge-level readoutTradespeople running high-draw tools like saws and grinders
Pros
  • Built-in fuel gauge shows charge at a glance
  • Makita rates a 45-minute charge on the Rapid Optimum Charger
  • Resists self-discharge during long storage
  • Fits the full 18V LXT tool range with Star Protection
  • 5.0Ah capacity balances runtime against bulk
Cons
  • Heavier than the 3.0Ah packs
  • Needs a Star Protection tool and a compatible charger
  • Charger is sold separately
  • Not the longest runtime in the LXT line

Makita BL1850B 18-Volt LXT Lithium-Ion High Capacity Battery Pack 5.0Ah with Fuel Gauge prices at every store

  • RAFSUPPLY.COMNew

    In stockReturn policy

    $157.00Checked Nov 7
    Visit RAFSUPPLY.COM
  • The Home DepotNew

    In stock

    $169.00Free shippingChecked 2 h ago
    Visit The Home Depot
  • Fasteners IncNew

    In stockReturn policy

    $169.00Checked Nov 7
    Visit Fasteners Inc
  • Root BrothersNew

    In stockReturn policy

    $169.00Checked Nov 7
    Visit Root Brothers
  • AmazonNew

    Availability unknown

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

    $93.00Free shippingChecked 2 h ago
    Visit Amazon
  • MSC Industrial SupplyNew

    Availability unknown

    $422.00Checked 2 h ago
    Visit MSC Industrial Supply
  • eBayNew

    Availability unknownSold by significantservices

    $659.73Checked 2 h ago
    Visit eBay
  • Grainger Industrial SupplyNew

    Availability unknown

    $1,820.51Checked 2 h ago
    Visit Grainger Industrial Supply

Store links may earn us a commission.

Makita BL1850B 18-Volt LXT Lithium-Ion High Capacity Battery Pack 5.0Ah with Fuel Gauge price history

Lowest price we've seen: $93.00 on Nov 14 at Amazon. Tracked across 5 stores since Nov 14.

What reviewers say

Owners generally rate the BL1850B highly for its charge speed and the fuel gauge, and many keep several in rotation. Complaints center on weight and on the charger being a separate purchase.

What people mention
  • Charge timePraisedOwners say it recharges quickly on the Rapid Optimum Charger, so downtime between tools is short.
  • Fuel gaugePraisedThe four-stage gauge is called accurate and useful for checking a pack before a job.
  • WeightCriticisedSome users find the 5.0Ah pack noticeably heavier than 3.0Ah batteries in overhead work.
  • StoragePraisedOwners report the pack holds charge well when left unused for weeks.
  • ChargerMixedThe fast charge depends on the Rapid Optimum Charger, which is not included with the battery.

About the Makita BL1850B 18-Volt LXT Lithium-Ion High Capacity Battery Pack 5.0Ah with Fuel Gauge

The Makita BL1850B is an 18V LXT lithium-ion battery with a 5.0Ah capacity. It provides up to 65% more run time per charge than the BL1830. It reaches full charge in 45 minutes or less when used with the Makita Rapid Optimum Charger, which is sold separately.

An integrated LED indicator shows the battery's charge level. The battery resists self-discharge, so it stays ready for use after long periods of storage. It delivers consistent power and run time in extreme temperatures, even in winter (-4°F/-20°C).

STAR Protection computer controls let the tool and battery exchange data in real time. They monitor conditions during use to protect against overloading, over-discharging and overheating. The battery has an impact-resistant outer case and a shock-absorbing inner liner. Sixteen contact terminals keep a constant connection with the tool to help prevent power loss or fluctuation, even during high-vibration use.

Model
BL1850B
Voltage
18V LXT lithium-ion
Capacity
5.0Ah
Charge time
45 minutes or less to full charge
Run time
Up to 65% more per charge than the BL1830
Charge indicator
Integrated LED battery charge level indicator
Compatibility
Star Protection tools only, marked with the Star Symbol and/or a yellow battery receiver under the tool
Protection
STAR Protection computer controls against overloading, over-discharging and overheating
Contacts
16 contact terminals
Case
Impact-resistant outer case with shock-absorbing inner liner

Questions and answers

Does this battery fit all Makita 18V tools?
It fits 18V LXT tools that carry the Star Protection symbol or yellow battery receiver. Older non-Star tools are not supported.
How long does it take to charge?
Makita rates a 45-minute charge on the Rapid Optimum Charger. A standard charger will take longer.
Is the charger included?
No. The Rapid Optimum Charger is sold separately, so budget for one if you do not already own it.
How does it compare with the 3.0Ah pack?
It gives more runtime per charge but weighs more. The 3.0Ah pack suits lighter tools and overhead work.
Does it lose charge in storage?
Makita says the cells resist self-discharge, so the pack is ready after long periods unused.
Can I use it in cold weather?
The pack works in cold conditions, but the Rapid Optimum Charger's fan helps it charge efficiently in heat.
Where is the Makita BL1850B 18-Volt LXT Lithium-Ion High Capacity Battery Pack 5.0Ah with Fuel Gauge cheapest?
At Amazon, for $93.00, 45% under what the other stores charge, as of our latest check.
Where can I buy the Makita BL1850B 18-Volt LXT Lithium-Ion High Capacity Battery Pack 5.0Ah with Fuel Gauge?
8 stores we checked sell it, including The Home Depot, Amazon, MSC Industrial Supply, eBay, Grainger Industrial Supply.

Stores we've priced the Makita BL1850B 18-Volt LXT Lithium-Ion High Capacity Battery Pack 5.0Ah with Fuel Gauge at

  • Grainger Industrial Supply deals and prices
  • MSC Industrial Supply deals and prices
  • The Home Depot deals and prices

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Works in extreme temperatures, including winter (-4°F/-20°C)
Charger
Not included; Makita Rapid Optimum Charger sold separately
Warranty
3-year limited warranty
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