Makita 191E81-6X (Bulk BL4040) 40V Max XGT 4.0Ah Li-Ion Battery Pack

The Makita 191E81-6X 40V Max XGT® 4.0Ah Battery Pack delivers the performance required for demanding jobs on-site and in the shop. Built for compatibility with the XGT cordless tool platform, this high-capacity battery provides the sustained power and advanced protection technology that professionals need to stay productive in high-load applications. Whether you’re powering a heavy-duty rotary hammer, impact wrench, or outdoor power equipment, the BL4040 is designed to keep up with modern-day work environments where runtime, durability, and recharge speed matter.

Smart internal electronics communicate with compatible XGT chargers and tools to help manage temperature, optimize power delivery, and extend overall battery life. The advanced internal structure includes shock-absorbing construction and an impact-resistant outer shell to withstand drops, dust, and harsh weather conditions. Charging to full in just 45 minutes (with DC40RA, sold separately), this battery keeps your downtime to a minimum. Four LED indicators let you check battery charge at a glance—no guesswork, no surprises.

This bulk-packaged version (191E81-6X) is ideal for tool fleets, workshops, and service departments already equipped with tools and chargers in the Makita XGT® lineup.

Makita 40V Max XGT 4.0Ah Li-Ion Battery Pack At a Glance

• Digital Communication Technology: Protects against overload, over-discharge, and overheating while optimizing performance
• Impact-Resistant Case: Durable outer housing and shock-absorbing inner liner help prevent damage from drops and vibration
• Fast Recharge Time: Fully recharges in as little as 45 minutes with Makita’s 40V max Rapid Charger (DC40RA)
• LED Charge Level Indicators: Four bright green LED lights show remaining battery life instantly
• Heavy-Duty Rails: Rigid battery rails ensure secure attachment and consistent power delivery during high-demand applications
• Water and Dust Resistant: Triple-layer structure helps defend against jobsite contaminants

Markets

• Construction and Framing Crews Reliable power for high-draw cordless tools like circular saws, rotary hammers, and impact wrenches on demanding builds.
• Industrial and Equipment Maintenance Smart monitoring and fast recharge keep downtime low when servicing equipment in production or remote locations.
• Landscaping and Groundskeeping Powers XGT outdoor power tools such as mowers, trimmers, and blowers with long-lasting runtime and tool protection.
• Electrical Contractors Ideal for extended use with core drilling rigs, saws, and installation tools where access to outlets is limited.
• Municipal and Utility Workers Rugged build holds up in the field while delivering consistent power for infrastructure work and inspections.
• Tool Rental Yards Reliable and durable battery option for shops managing tool fleets that require high uptime and quick turnaround.
• Appliance and HVAC Technicians Compatible with heavy-duty cordless vacuums, fans, and diagnostic tools for mobile work across multiple service calls.

Heavy construction crews, equipment repair shops, and electrical contractors benefit from the high-output performance and extended runtime of this 4.0Ah battery. It’s ideal for continuous-use environments where corded alternatives aren’t practical and runtime demands are high. Landscaping professionals using cordless OPE and mobile service techs relying on cordless power in remote settings will appreciate its fast recharge and smart protection features. With rugged casing and built-in communication safeguards, the battery can keep up with full-day usage, tool changes, and jobsite exposure without interruption.

Makita BL4040 40V Max XGT 4.0Ah Li-Ion Battery Pack Features

• Battery charge level with 4 bright green L.E.D. indicators allows the user to clearly see charge level
• Reaches full charge in 45 minutes or less
• Enhanced cooling system is engineered to maximize battery life
• XGT® batteries features an advanced design impact-resistant outer case and shock-absorbing inner-liner engineered to protect the battery in harsh jobsite environments
• The digital communication within XGT® optimizes performance to provide up to 2X longer sustained power under heavy-load applications
• XGT® Tools and Batteries are designed with a multi-layer contact interface for more constant power delivery to take on high-current demands
• The digital communication within XGT® actively monitors and protects against overload, over-discharge and overheating
• XGT® Batteries feature rigid rails with impact-resistant construction to secure the battery to the tool during high-demand applications
• CONVENIENCE : Battery charge level with 4 bright green L.E.D. indicators to clearly see charge level
• EFFICIENCY : Reaches full charge in 45 minutes or less
• DURABILITY : XGT® batteries feature advanced design impact-resistant outer case and shock-absorbing inner-liner
• TECHNOLOGY : Digital communication within XGT® actively protects against overload, over-discharge and overheating
• INCLUDES : 40V max XGT® 4.0Ah Battery
• 3-year limited warranty

Makita BL4040 40V Max XGT 4.0Ah Li-Ion Battery Pack Specifications

• System: 40V max XGT®
• Voltage: 40V
• Battery Capacity: 4.0Ah
• Battery Type: Lithium-Ion
• Charge Time: 45 minutes (with DC40RA rapid charger)
• LED Charge Indicator: Yes (4-stage)
• Dimensions (L x W x H): 5-1/4″ x 3-1/4″ x 2-13/16″
• Shipping Dimensions: 6.5″ x 6.5″ x 3″
• Weight: 2.25 lbs.
• Part Number: 191E81-6X (Bulk)
• UPC Code: 088381583664

Makita BL4040 40V Max XGT 4.0Ah Li-Ion Battery Pack Includes

• (1) 40V max XGT® 4.0Ah Li-Ion Battery (BL4040)

Makita BL4040 40V Max XGT 4.0Ah Li-Ion Battery Pack Warranty

• Makita’s 3-Year Limited Warranty

Why Professionals Choose the Makita 40V Max XGT 4.0Ah Li-Ion Battery Pack

Professionals trust the Makita 40V Max XGT 4.0Ah Battery for its ability to hold up in rough working environments while delivering class-leading power for cordless applications. Often referred to on the job as a “brick” or “beast battery,” this pack is known for its balance of runtime and portability. From cutting concrete to powering through overgrown brush, the BL4040 battery is a go-to for any Makita XGT tool user who needs power that doesn’t quit. Whether you’re chasing speed, reliability, or less downtime between charges, this battery delivers.