Will this battery fit my Makita 18V tool?

Only if the tool has the Star Symbol or a yellow battery receiver under the mount. Older 18V LXT tools without the Star Symbol will not accept it.

How long does it take to charge?

Makita rates it at 45 minutes or less to full charge on a compatible rapid charger. Charge time is longer on a standard charger.

Is it worth upgrading from the BL1830?

Makita claims up to 65% more run time per charge than the 3.0Ah BL1830. If you run saws or grinders hard, the extra capacity is worth it.

Does it come with a charger?

No. The box contains one BL1850B battery only. Chargers are sold separately.

How does the 5.0Ah compare to Makita's larger packs?

The 5.0Ah is lighter and cheaper than Makita's 6.0Ah and larger packs, but gives less run time in high-draw tools.

Is $97.49 a good price?

That is the best new price across 9 stores as of November 7, 2026, at the low end of its recent range. It is a fair price for a genuine 5.0Ah pack.

What do buyers say about the Makita BL1850B 18V LXT Lithium-Ion 5.0Ah Battery?

Rated 5 out of 5 from 9 ratings.

Where can I buy the Makita BL1850B 18V LXT Lithium-Ion 5.0Ah Battery?

17 stores we checked sell it, including Amazon, Coastal Tool, Value Tools Co, Significant Services Inc, My Parts Store.

Makita BL1850B 18V LXT Lithium-Ion 5.0Ah Battery

Q: Where is the Makita BL1850B 18V LXT Lithium-Ion 5.0Ah Battery cheapest?

At Amazon, for $97.49, 19% under what the other stores charge, as of our latest check.

Best price now

$97.49at AmazonObserved at 7:13 AM

19% under what the other stores charge

Compared across 9 stores. Prices are checked against each store and labelled with when.

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

The Makita BL1850B is a 5.0Ah, 90Wh lithium-ion pack for Makita's 18V LXT cordless tools. It reaches full charge in 45 minutes or less and has an on-board LED charge indicator. Makita rates it at up to 65% more run time per charge than the older 3.0Ah BL1830. At $97.49 at Amazon as of November 7, 2026, it sits at the low end of what the 5.0Ah pack has sold for across 9 stores listing it new.

What reviewers say

Owners of Makita 18V LXT tools generally rate the BL1850B highly for run time and fast charging. The main complaints are the Star Symbol compatibility limit and the price of genuine packs.

What people mention

Run timePraisedOwners say the 5.0Ah pack lasts noticeably longer than the 3.0Ah BL1830 in saws and drivers.
Charge timePraisedReviewers like getting back to work in 45 minutes or less on a Makita rapid charger.
CompatibilityCriticisedBuyers report it only fits tools with the Star Symbol or yellow battery receiver.
PriceMixedSome find genuine Makita packs expensive next to third-party alternatives.
Cold weatherPraisedUsers say it keeps working in freezing conditions where other packs fade.

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

Makita BL1850B 18V LXT® Lithium‑Ion 5.0Ah Battery

EFFICIENCY : Integrated L.E.D. battery charge level indicator allows user to monitor battery charge

INNOVATION : Reaches full charge in 45 minutes or less

PERFORMANCE : Provides up to 65% more run time per charge compared to BL1830

CONVENIENCE : Compatible only with Makita 18V Lithium-Ion tools with Star Symbol™ and/or Yellow Battery Receivers

INCLUDES : 18V LXT® Lithium-Ion 5.0Ah battery

The Makita 18V 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 5.0Ah battery has a category-leading charge time of only 45 minutes, so it spends more time working and less time sitting on the charger.

The 18V LXT® 5.0Ah battery is compatible only with Star Protection tools, indicated by the Star Symbol™ and/or Yellow Battery Receiver under the tool.

Makita 18V 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 largest cordless tool system powered by 18V lithium-ion slide-style batteries.

FEATURES

• Integrated L.E.D. battery charge level indicator allows user to monitor battery charge

• Provides up to 65% more run time per charge compared to BL1830

• Reaches full charge in 45 minutes or less

• Compatible only with Star Protection tools, indicated by the Star Symbol™ and/or Yellow Battery Receiver under the tool

• Battery delivers consistent power and run time in extreme temperatures, even in winter (-4°F/-20°C)

• Equipped with Star Protection Computer Controls™ to protect against overloading, over-discharging and over-heating

• Impact-resistant outer case and shock-absorbing inner-liner are engineered to protect the battery

• Sixteen contact terminals maintain a constant connection with the tool to help prevent power loss or fluctuation, even during high-vibration applications