‹ All Makita 18V LXT batteries

18V LXT

Fits

115 Makita 18V LXT tools + 32 moreSee them ›

Charges

36 min on 4 of the 6 chargers Makita lists for itCharge times ›

Specs

From Makita's own documentationChecked 14 Jun 2026

Makita · 18V LXT platform

Makita BL1840B 18V 4.0Ah LXT battery

4.0Ah 72Wh 0.64kg Fuel gauge

18V LXT 4.0Ah pack (72Wh), 0.64kg, with a charge level indicator and Star Protection.

Adds it to My Tools, kept on this device

Lowest price we track

£69.95at Tooled Up · + £6.95 delivery · Available to order

View at Tooled Up ›

Compare retailersTotal with delivery

Tooled Up Lowest£69.95 + £6.95 delivery · Available to order£76.90View ›

My Tool Shed£69.95 + £6.95 delivery · Available to order£76.90View ›

Prices from UK retailer feeds, updated daily.We may earn a commission

4.0AhCapacitymaker figure

72WhEnergymaker figure

0.64kgWeightmaker figure

113Wh/kgEnergy for its weightworked out

£17.49Per Ahat the lowest price we track

Other sizes in this range

Same fit, same tools. Bigger packs run longer and weigh more. Pick the size for the job.

Compare these sizes ›All Makita 18V LXT batteries ›

ModelSizeEnergyWeightLowest pricePer Ah

BL1820B 2.0Ah 36Wh 0.38kg £49.95 £24.98 per Ah

BL1830B 3.0Ah 54Wh 0.64kg £59.95 £19.98 per Ah

BL1840B This one 4.0Ah 72Wh 0.64kg £69.95 £17.49 per Ah

BL1850B 5.0Ah 90Wh 0.63kg £59.95 £11.99 per Ah

BL1860B 6.0Ah 108Wh 0.66kg £79.95 £13.33 per Ah

BL1890 9.0Ah 162Wh 0.97kg £119.98 £13.33 per Ah

BL18120 12.0Ah 216Wh 1.3kg £129.95 £10.83 per Ah

Prices are the lowest we track at UK retailers, updated daily. Weights from Makita. Energy is Makita's figure, or worked out from volts × Ah where they don't publish one.

Full specs

From Makita's own documentation, checked 14/06/2026. "Not listed" where Makita doesn't publish a figure.

Voltage18V

Capacity4.0Ah

Energy72Wh

ChemistryLi-ion (cylindrical)

Cell typeNot listed

Weight0.64kg

Size (L × W × H)113 × 75 × 62 mm

Fuel gaugeYes

ExtrasStar Protection

PlatformMakita 18V LXT

Model codeBL1840B

Charge times

Makita's own figures, fastest first. Each charger opens its own page.

DC18RCRapid charger

36 min

£39.95 at Tooled Up ›

DC18RC/1Rapid charger

36 min

£59.95 at Tooled Up ›

DC18RDTwin-port rapid charger

36 min

£89.95 at Tooled Up ›

DC18RD/1Twin-port rapid charger

36 min

£119.95 at Tooled Up ›

DC18SDCharger

1 hr 30 min

£29.95 at Tooled Up ›

DC18SHDual charger

1 hr 30 min

£89.95 at Tooled Up ›

Makita's own figures. We may earn a commission

Fits these tools

Every Makita 18V LXT tool takes this pack. It won't fit other brands' tools.

All 115 Makita 18V LXT tools ›

Impact Wrenches15 tools › Impact Drivers10 tools › Combi Drills9 tools › SDS+ Hammer Drills8 tools › Drill Drivers8 tools › Angle Grinders8 tools › Handheld Vacuums7 tools › Reciprocating Saws6 tools › Jigsaws6 tools › Circular Saws6 tools › Sheet & Palm Sanders5 tools › Multi-Tools4 tools › Brad Nailers3 tools › Second Fix Nailers3 tools › First Fix Nailers2 tools › Planers2 tools › Angle Drills2 tools › Ratchets1 tool › Demolition Hammers1 tool › Dual Action Polishers1 tool › Rotary Polishers1 tool › Drywall Sanders1 tool › Belt Files1 tool › Pin Nailers1 tool › Random Orbital Sanders1 tool › Trim Routers & Edge Trimmers1 tool › Site Vacuums1 tool › Mitre Saws1 tool ›

2×

Also runs 32 Makita 18V Twin (36V) tools, as a pairBigger tools that take two of these packs at once.

See them ›

4.0Ah packs from other brands

Only useful if you haven't picked a platform yet: packs don't swap between brands. Shown on neutral figures only.

Not sure which platform? ›

BatteryEnergyWeightWh per kgLowest pricePer Ah

MakitaBL1840B 72Wh 0.64kg 113 £69.95£17.49

BoschPROCORE18V-40 72Wh 0.52kg 140 £54.99£13.75

Bosch Green1600A011T8 72Wh 0.64kg 113 £59.95£14.99

DeWaltDCB182 72Wh 0.61kg 118 £49.95£12.49

Einhell4511396 72Wh 0.67kg 107 £36.95£9.24

FestoolBP18Li4.0HPC 72Wh 0.6kg 120 £155.95£38.99

BL1840B questions

Which tools does the BL1840B fit?

It fits every Makita 18V LXT tool, and two of them run the Makita 18V Twin (36V) tools. It won't fit other brands' tools.

How long does the BL1840B take to charge?

From Makita's own figures: DC18RC: 36 min, DC18RC/1: 36 min, DC18RD: 36 min, DC18RD/1: 36 min, DC18SD: 1 hr 30 min, DC18SH: 1 hr 30 min.