L1840R 18V 4.0Ah 72Wh Replacement Lithium-Ion Battery for 18V Power Tool Platforms — Rechargeable OEM Pack

Overview

The HNF Battery L1840R is an 18V 4.0Ah 72Wh rechargeable lithium-ion replacement battery pack designed for compatibility with 18V slide-rail cordless power tool platforms. Built to deliver professional-grade runtime and reliable charge cycle performance, the L1840R is a direct drop-in replacement for worn or depleted original battery packs, offering tradespeople, contractors, and workshop users a cost-effective alternative to OEM pricing without sacrificing capacity or build quality.

The pack features a robust engineering-grade plastic housing with reinforced slide-rail contacts and an orange release button that mirrors the ergonomics of the original platform interface, allowing quick, one-handed battery swaps between tools. The internal cell assembly uses high-grade 18650 lithium-ion cells matched for capacity and internal resistance, ensuring consistent performance across the full charge and discharge cycle.

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Key Specifications

• Model: L1840R
• Nominal Voltage: 18V
• Capacity: 4.0Ah
• Energy: 72Wh
• Cell Format: 18650 Li-ion
• Interface: Slide-rail (18V platform compatible)
• Release Button: Orange push-release
• BMS: Integrated multi-protection
• Operating Temperature: 0°C to 40°C (charging)
• Certification: UN38.3, MSDS
• MOQ: 20 pcs
• OEM/ODM: Available

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Extended Runtime for Professional Use

At 4.0Ah and 72Wh, the L1840R offers substantially more runtime than standard 2.0Ah entry-level packs shipped with many cordless tool kits. Practical runtime advantages include approximately 40 to 60 minutes of continuous drilling with a 18V combi drill under moderate load, extended cutting sessions with circular saws and reciprocating saws without mid-job recharges, sustained operation of 18V angle grinders, impact drivers, and multi-tools through longer work cycles, and reduced downtime on job sites where a second charged pack is not always available.

The higher capacity is particularly valuable for professionals using high-drain tools such as brushless angle grinders and circular saws, where a 2.0Ah pack may only last 15 to 20 minutes under continuous load.

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Intelligent BMS Protection

The L1840R includes an integrated battery management system that protects both the cells and the connected tool across all operating conditions. Protection functions include overcharge protection preventing cell voltage from exceeding 4.2V per cell during charging, over-discharge cutoff at approximately 2.75V per cell to preserve long-term cycle life, overcurrent protection limiting discharge current to safe levels under tool stall or jam conditions, short-circuit protection responding within milliseconds to terminal fault events, and temperature monitoring that reduces charge acceptance under high ambient temperature conditions. The BMS communicates with compatible tool platforms via the signal contact pins in the slide-rail interface, enabling fuel gauge display on tools and chargers that support this feature.

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Durable Housing and Contact Design

The L1840R housing is manufactured from impact-resistant engineering-grade ABS with reinforced ribbing at the corners and contact zone. The slide-rail interface is machined to tight tolerances for a firm, rattle-free fit across the range of compatible tool bodies and chargers. Gold-plated or nickel-plated contact terminals ensure low-resistance electrical connection and resist oxidation across hundreds of insertion cycles. The orange release button uses a spring-loaded latch mechanism that provides positive audible and tactile confirmation of both insertion and release, reducing the risk of accidental ejection during heavy vibration use.

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Charging and Storage

The L1840R charges via any compatible 18V platform charger using standard CC/CV lithium-ion charging protocol. Charge time from empty to full is approximately 60 to 80 minutes with a 3A charger and 40 to 50 minutes with a 5A fast charger. The BMS automatically terminates charging at full voltage and prevents trickle charging that degrades cell longevity over time.

For storage, the pack should be kept at approximately 50% state of charge in a cool, dry environment between 10°C and 25°C. The low self-discharge rate of the 18650 cells used in this pack means it retains most of its charge over several months of storage, making it suitable for seasonal use or standby inventory.

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OEM and Wholesale Supply

The L1840R is available for OEM private label supply to power tool distributors, repair workshops, and tool rental businesses. HNF Battery offers custom label printing on the housing, capacity options at 2.0Ah, 3.0Ah, 4.0Ah, and 5.0Ah within the same housing class, cell brand selection including Samsung, LG, Molicel, and equivalent-grade domestic cells, bulk packaging in quantities from 20 to 5,000 units, and mixed SKU orders combining the L1840R with other voltage platforms in the HNF Battery power tool range.

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Why Choose HNF Battery

HNF Battery is a factory-direct lithium battery manufacturer based in Dongguan, China, with experience supplying replacement and OEM battery packs to distributors and repair businesses across Europe, North America, and Australia. Our power tool battery line covers 12V, 18V, 20V, 36V, and 40V platforms with consistent cell quality, BMS reliability, and housing fit that meets the expectations of professional end users.

Contact us at sales@hnfbattery.com or WhatsApp +86 134-8090-2696 for samples, technical datasheet, or wholesale pricing.