Heimerdinger 4000mAh Replacement Battery and Charger for Makita 18V Battery Compatible with BL1840B for Cordless Power Tools

Name: Heimerdinger 4000mAh Replacement Battery and Charger for Makita 18V Battery Compatible with BL1840B for Cordless Power Tools
Brand: Heimerdinger
SKU: awhd-us-b0cqf9t7z2
Price: 37.93 USD
Availability: InStock

Brand: Heimerdinger

Condition: Used

$37⁹³

$43⁹⁹

-14% Save $6⁰⁶

Updated: 3 days ago

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Description

Specification:Battery type: Increase current protection Lithium | Voltage: 18V | Capacity: 4000mAh *1Pack+1 Charger | Brand new high-quality power tool battery. Applicable Model:Compatible with 18V LXT Cordless Power Tool, BL1860B,BL1850B, BL1840B, BL1830B... Increase Current Protection:Each battery cell increases current protection, compared with ordinary batteries, it can prevent common battery problems such as overheating/explosion/power instability！ Safe & Reliable:CE/FCC/RoHS Certified, built-in over-discharge, overload and short-circuit protection feature. Compatible with Cordless Power Tools:Such as your Makita 18V Drill / Circular Saw / Blower / Driver / Impact Wrench / Hedge Trimmer / Pipe Threader / Braking Grinder / Recip Saw / Band Saw / Hackzall / Chainsaw / Jig Saw / Nailer / Drywall Screw Gun / Rotary Hammer and so on ..

【High-quality battery】Upgraded 4000mAh battery which offers longer run time than the original one.

Input:100-240V

50-60Hz,0.8A

Output:21V,0.75A

The Heimerdinger 4000mAh Replacement Battery and Charger is a high-performance power solution designed for 18V cordless tools, ensuring seamless compatibility with models like BL1840B, BL1850B, and more. Crafted with premium lithium-ion cells, this battery delivers long-lasting durability and stable power output—never made from recycled or low-quality materials.

Featuring advanced current protection technology, it prevents overheating, over-discharge, and short circuits, while CE/FCC/RoHS certifications guarantee safety. Note: The included charger is not compatible with M@kita’s original chargers but pairs perfectly with Heimerdinger batteries. Power your drills, saws, blowers, and other 18V LXT tools with reliable energy—no compromises!

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Product Details

SKU:: awhd-us-b0cqf9t7z2
Model:: YD-CFJ21-10
Country:: US
ASIN:: B0CQF9T7Z2

Shopping Smarter

Common questions about buying open-box and refurbished.

Why buy refurbished or open-box?

Refurbished and open-box products offer the same performance as new at a fraction of the price. You're already saving $6 on this listing. They've been inspected, tested, and are ready to use — the only difference is the price tag. Buying refurbished also reduces electronic waste, extending product life cycles and keeping functional devices out of landfills.

What's the difference between open-box and refurbished?

Open-box products are customer returns that have been inspected and confirmed functional. They may show little to no use — often the item was returned simply because the buyer changed their mind. Refurbished products have been professionally repaired or restored by technicians, tested to meet or exceed manufacturer specifications, and sometimes come with a warranty. Both are a smart alternative to buying new.

Why use OpenBoxFox?

Finding refurbished deals is time-consuming — you'd have to check Amazon Warehouse, Reebelo, Dyson Outlet, and others separately for Heimerdinger products. OpenBoxFox aggregates these listings in one place, so you can compare and find the best deal without the legwork. We update pricing daily so you always see current availability and real savings.

Is it safe to buy refurbished?

Yes. Products listed on OpenBoxFox come from established retailers like Amazon, Reebelo, and Dyson — not unknown third-party sellers. Each retailer has buyer protection policies, return windows, and in some cases warranties. You get the price advantage of used goods with the purchase security of a known retailer.