Key Features
Overview
The Makita 40V max XGT 4.0Ah Battery, model BL4040, is a lithium-ion battery pack built for Makita’s 40V max XGT cordless platform. This is a cordless tool battery designed for powering Makita 40V max XGT tools in demanding jobsite applications. If you need a battery that charges quickly, stays locked into the tool under load, and is built for daily use instead of occasional weekend work, this is the one you’re looking at.
The headline numbers matter here for a reason. You get 40V max output, 4.0 amp hour capacity, and a full charge time of 45 minutes or less when paired with a compatible XGT charger. In plain terms, that means less downtime between tasks and a practical balance of runtime and weight. For contractors running blowers, saws, drills, grinders, or other high-draw XGT tools, that shorter turnaround can keep the workflow moving without needing a huge stack of backup packs.
Makita built this battery around more than just capacity. The BL4040 uses digital communication within the XGT system to optimize performance and help deliver up to 2X longer sustained power under heavy-load applications. It also actively monitors overload, over-discharge, and overheating. That is the kind of feature that matters when the tool is being pushed hard, because the battery is not just feeding power blindly. It is part of the system managing output and protection in real time.
Physically, this battery is clearly made for jobsite abuse. Makita calls out an impact-resistant outer case, a shock-absorbing inner liner, and rigid rails with impact-resistant construction to help secure the battery to the tool during high-demand work. That matters if your tools live in gang boxes, truck beds, trailers, or get passed around a crew. A battery pack takes more hits than most people admit, so a tougher housing is not fluff here.
Day-to-day usability is also well thought out. The integrated battery charge level indicator uses four bright LED lights so you can check remaining charge before climbing a ladder, heading across a site, or starting a cut. That is a small feature until you do not have it. On a platform battery, quick charge checks save time and help you decide whether to swap packs before the tool slows down.
Compatibility is straightforward. This battery is part of the Makita 40V max XGT system and is intended for XGT tools and XGT chargers. Chargers are sold separately, but the platform communication between battery and charger is a big part of why Makita can deliver both fast charging and active battery protection. If you are already on XGT, the BL4040 makes sense as a daily-use pack or an extra battery to keep in rotation.
Who should buy it? This battery is a strong fit for pros and serious DIY users who already own Makita XGT cordless tools and want a compact, work-ready battery with quick recharge time. It makes the most sense for users who need a reliable everyday pack rather than the biggest, heaviest battery available. If you want a 40V max XGT battery that balances runtime, charge speed, durability, and manageable size, the BL4040 hits that sweet spot.
Built to Keep the Rotation Moving
This battery is sized for real use, not shelf appeal. It gives you enough capacity for demanding cordless work without going oversized, which helps keep the tool setup balanced in hand.
- 4.0Ah lithium-ion battery for Makita 40V max XGT tools
- Rigid battery rails are built to hold securely during high-demand applications
See Charge Status at a Glance
The built-in four LED gauge lets you check battery status before you start the next task. That helps cut down on surprise battery swaps in the middle of a cut, fastening run, or cleanup pass.
- Integrated LED charge level indicator with four bright lights
- Fast full charge time of 45 minutes or less with a compatible XGT charger
What’s in the Box
- (1) Makita BL4040 40V max XGT 4.0Ah Battery
Charger sold separately.
Key Specifications
 Voltage | 40V max |
|---|---|
|
Battery Capacity | 4.0Ah |
 Battery Type | Lithium-Ion |
|
Battery Charge Time | 45 minutes or less |
 Dimensions (L x W x H) | 5-1/4 in x 3-1/4 in x 2-13/16 in |
 Weight | 2.2 lbs |
Compatibility
Pro Tip
Use the four LED gauge before you head up a ladder, onto a roof, or across a large site. With a battery like the BL4040, that quick check saves you from carrying the wrong pack or stopping halfway through the job to swap out.
Warranty & Support
Tool Nut’s Take
Makita 40V max XGT 4.0Ah Battery is the everyday XGT pack most users actually need
If you want a practical XGT battery with fast charging, solid runtime, and jobsite-friendly durability, this is the one that makes the most sense for daily rotation.
- Who it’s for: Makita XGT users who want a dependable battery for regular use across drills, saws, outdoor power equipment, and other cordless tools on the 40V max platform.
- Why it stands out: The 45-minute-or-less charge time, built-in LED fuel gauge, and tougher battery construction make it more than just a spare pack.
- Worth knowing: This is a battery only. If you are not already on the XGT platform, you will need a compatible charger and XGT tool to put it to work.
Common Questions
- What platform is this battery for? It is designed for Makita 40V max XGT tools.
- How long does it take to charge? Makita states it reaches a full charge in 45 minutes or less with a compatible XGT charger.
- Does this battery have a charge indicator? Yes. It has an integrated four LED battery charge level indicator.
- What protections are built into the battery? The XGT system actively monitors and helps protect against overload, over-discharge, and overheating.
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