Makita Cordless Battery BL1850B 5.0Ah Slide Lithium-Ion LXT Pack (18V 45 Min Charge Star Protection Fuel Gauge High Drain Power Tool Fastening)
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Makita BL1850B 18V LXT Lithium-Ion 5.0Ah Slide-Style Battery Pack with Star Protection
The Makita BL1850B 18V LXT 5.0Ah lithium-ion battery powers high-drain cordless circular saws, heavy-duty rotary hammers, angle grinders, and multi-speed impact drivers across demanding residential and commercial construction jobsites. Engineered to yield up to 65% more operational runtime per charge than standard 3.0Ah packs, this 1.4-lb slide-style battery achieves a complete 100% recharge in only 45 minutes using a Makita Rapid Optimum Charger. Outfitted with an integrated 4-stage LED fuel gauge, 16 firm-holding slide terminal rails to prevent power cutouts during high vibration, and digital Star Protection Computer Controls to eliminate overloading and overheating, it provides framers, electricians, and concrete contractors with long-lasting cordless energy.
Best Used For:
- High-Demand Heavy Wood & Metal Cutting: Driving cordless circular saws, reciprocating saws, and metal cutoff saws continuously through dense lumber and structural steel unhindered by voltage sag.
- Rotary Hammer Masonry Drilling & Chipping: Powering SDS-Plus rotary hammers through repeated foundation anchor drilling with shock-absorbing cell protection against heavy recoil.
- High-Volume Structural Fastening Passes: Supplying extended power to high-torque impact wrenches and impact drivers for driving commercial ledger lags and concrete screws all day.
Key Performance & Safety Features
- Extended 5.0Ah Energy Density: Delivers up to 65% more runtime per single charge cycle compared to the BL1830 3.0Ah battery for continuous high-load tool use.
- 45-Minute Fast Charge Capability: Reaches full 100% operational charge in 45 minutes or less when coupled with fan-cooled Makita Rapid Optimum charging bases.
- Integrated 4-LED Charge Gauge: Onboard battery fuel indicator allows tradesmen to check remaining capacity levels immediately at the press of a button.
- Star Protection Computer Controls: Intelligent communication protocol exchanges real-time data between the tool and battery to prevent overload, over-discharge, and thermal damage.
- Sixteen Multi-Contact Slide Terminals: High-grip terminal configuration ensures continuous electrical contact and eliminates power drops during extreme tool vibration.
- Reinforced Shock-Absorbing Casing: Rugged, impact-resistant outer shell paired with a shock-damping inner liner safeguards cylindrical lithium cells against jobsite drops.
What's Included
- (1) Makita BL1850B 18V LXT Lithium-Ion 5.0Ah Battery Pack with LED Charge Level Indicator
Technical Specifications
| Manufacturer | Makita Tools |
| Model / Part Number | BL1850B (197280-8) |
| Cordless Battery Platform | Makita 18V LXT Slide-Style System |
| System Voltage Rating | 18.0 Volts DC |
| Rated Battery Capacity | 5.0 Amp-Hours (5.0Ah / 90 Watt-Hours) |
| Internal Cell Chemistry | High-Capacity Cylindrical Lithium-Ion |
| Rapid Charge Time (DC18RC) | 45 Minutes or Less to Full 100% Charge |
| Charge Level Monitoring | Integrated 4-Stage LED Battery Fuel Gauge |
| Terminal Connection Design | 16 Multi-Contact Heavy-Duty Slide Rails |
| Active Electronic Protection | Star Protection Computer Controls (Thermal, Overload, Low-Voltage) |
| Low Self-Discharge Engineering | Maintains Stored Charge Across Long Periods of Inactivity |
| Tool Unit Net Weight | 1.40 lbs (22.4 oz / 0.64 kg) |
| Physical Dimensions (L x W x H) | 4.50 in x 3.00 in x 2.50 in (114.3 mm x 76.2 mm x 63.5 mm) |
| Manufacturer Warranty | 3-Year Limited Manufacturer Warranty |
Pro-Tip: Press the rear fuel gauge button before high-torque fastening or cutting passes to confirm full 4-bar charge; maintaining full charge prevents current throttling and ensures your brushless motors operate at maximum output torque.