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Makita
Makita Lithium-Ion Battery, 18V, 5.0Ah – BL1850B

Makita Lithium-Ion Battery, 18V, 5.0Ah – BL1850B

5(9 ratings)

Best price now

$97.49at AmazonChecked 1 h ago

42% under what the other stores charge

Compared across 9 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: $97.49 at Amazon (checked Nov 14, 2026).
  • Checked at 9 stores.

Our take on the Makita Lithium-Ion Battery, 18V, 5.0Ah – BL1850B

The Makita BL1850B is an 18V lithium-ion battery pack rated at 5.0Ah, part of Makita's LXT line. It has a four-bar charge level indicator, foam cell technology and a slide-on mount with multi-contacts and a shock-absorbing case. It is the same size and weight as Makita's 3.0Ah and 4.0Ah packs, so it fits the same tools and chargers while giving longer runtime. It suits owners of Makita 18V tools who want more runtime per charge without a heavier pack.

Best forMakita 18V LXT tool ownersLonger runtime on saws and grindersBuying a spare or replacement packUsers who want a charge gauge on the battery
Pros
  • 5.0Ah capacity gives longer runtime than 3.0Ah and 4.0Ah packs
  • Same size and weight as the smaller Makita packs
  • Four-bar charge level indicator
  • Slide-on mount with multi-contacts and shock-absorbing case
  • Works with existing Makita Li-ion chargers
  • About 45 minutes to charge
Cons
  • Needs about 6 to 8 full charges to reach full performance when new
  • Heavier than a compact 1.5Ah or 2.0Ah pack
  • No charger included
  • Genuine Makita cells cost more than third-party packs

Makita Lithium-Ion Battery, 18V, 5.0Ah – BL1850B prices at every store

  • InpexOpcionNew

    In stockReturn policy

    $100.00Checked Nov 7
    Visit InpexOpcion
  • Dust ArrestNew

    In stockReturn policy

    $130.00Checked Nov 7
    Visit Dust Arrest
  • The Home DepotNew

    In stock

    $169.00Free shippingChecked 1 h ago
    Visit The Home Depot
  • Witmer Motor ServiceNew

    In stockReturn policy

    $169.00Checked Nov 7
    Visit Witmer Motor Service
  • AmazonNew

    Availability unknown

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

    $97.49Free shippingChecked 1 h ago
    Visit Amazon
  • MSC Industrial SupplyNew

    Availability unknown

    $422.00Checked 1 h ago
    Visit MSC Industrial Supply
  • eBayNew

    Availability unknownSold by significantservices

    $659.73Checked 1 h ago
    Visit eBay
  • ImperialSupplies.comNew

    Availability unknown

    $1,820.50Checked 1 h ago
    Visit ImperialSupplies.com
  • Grainger Industrial SupplyNew

    Availability unknown

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

Store links may earn us a commission.

Makita Lithium-Ion Battery, 18V, 5.0Ah – BL1850B price history

Lowest price we've seen: $97.49 on Nov 14 at Amazon. Tracked across 6 stores since Nov 14.

What reviewers say

Owners of Makita 18V tools generally rate the BL1850B highly for runtime and for fitting the same tools and chargers as the smaller packs. The charge gauge is a commonly mentioned convenience. Some note the break-in period and the higher cost of genuine packs.

What people mention
  • RuntimePraisedOwners say the 5.0Ah pack runs noticeably longer than the 3.0Ah and 4.0Ah packs in the same tools.
  • Charge indicatorPraisedThe four-bar gauge is called useful for checking power before starting a job.
  • Break-inMixedSome note the pack needs several full charges before it delivers its best runtime.
  • WeightMixedIt matches the smaller packs in size and weight, but it is heavier than compact 1.5Ah and 2.0Ah packs.
  • ValueMixedGenuine Makita packs are seen as reliable but costlier than third-party alternatives.

About the Makita Lithium-Ion Battery, 18V, 5.0Ah – BL1850B

The Makita BL1850B is an 18V, 5.0Ah lithium-ion battery with a charge level indicator. Four bars show how much power is left.

It slides onto the tool and is held firmly by multiple contacts. The shock-absorbing pack will not puncture and stays cool even in heavy use. It uses foam cell technology. It is the same weight and size as a 3Ah or 4Ah battery and works with your current Li-ion chargers.

It charges in 45 minutes. When new, the battery needs about 6 to 8 full charges to reach its best performance.

Model
BL1850B
Voltage
18V
Capacity
5.0Ah
Battery type
Lithium-ion
Charge time
45 min
Weight
0.63 kg
Indicator
Charge level indicator with four bars
Compatibility
Fits all Makita 18V LXT tools, including DTD173, DTD157 and DTD156 impact drivers, DDF486, DDF489, DDF487 and DDF482 driver drills, and DGA508, DGA518 and DGA505 125mm angle grinders
Chargers
Works with Makita Li-ion chargers
Warranty
12 months for batteries and chargers (void if the seal is damaged or removed)

Questions and answers

Does the BL1850B fit all Makita 18V tools?
It uses Makita's 18V LXT slide-on mount, so it fits tools and chargers in that line. It does not fit Makita's 12V, 40V or older Ni-Cad tools.
How long does it take to charge?
About 45 minutes on a compatible Makita Li-ion charger. Charging time depends on the charger model.
Is it the same size as the 3.0Ah and 4.0Ah packs?
Yes. Makita lists the same size and weight as its 3.0Ah and 4.0Ah batteries, so it fits the same tools and holsters.
Why does it seem weaker when new?
Makita says new packs need about 6 to 8 full charge and discharge cycles to reach optimum performance.
Does it come with a charger?
No. It is the battery pack only and works with existing Makita Li-ion chargers.
Can I leave it on the charger?
Makita's Li-ion chargers are designed for the packs, but for best life store the battery cool and partly charged if it will sit unused for long.
Where is the Makita Lithium-Ion Battery, 18V, 5.0Ah – BL1850B cheapest?
At Amazon, for $97.49, 42% under what the other stores charge, as of our latest check.
What do buyers say about the Makita Lithium-Ion Battery, 18V, 5.0Ah – BL1850B?
Rated 5 out of 5 from 9 ratings.
Where can I buy the Makita Lithium-Ion Battery, 18V, 5.0Ah – BL1850B?
9 stores we checked sell it, including The Home Depot, Amazon, MSC Industrial Supply, eBay, ImperialSupplies.com.

Stores we've priced the Makita Lithium-Ion Battery, 18V, 5.0Ah – BL1850B at

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

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