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Power Tool 18V · 4.0Ah
Milwaukee WK18-XC40 18V 4.0Ah
Milwaukee M18 RedLithium XC 4.0 Replacement

Milwaukee WK18-XC40 M18 18V 4.0Ah Replacement Battery

Drop-in replacement battery for the Milwaukee M18 platform. The WK18-XC40 is a true 4.0Ah 18V Li-ion M18 replacement battery (5S2P, 18650) and a direct replacement for the Milwaukee 48-11-1840 M18 RedLithium XC 4.0 battery, with verified BMS handshake on genuine Milwaukee chargers. Built on a Nuranu proprietary in-house mold for exact OEM fit.

Voltage18V
Capacity4.0Ah
Cell Type18650 cells
Configuration5S2P
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Overview

Drop-in replacement battery for the Milwaukee M18 platform. The WK18-XC40 is a true 4.0Ah 18V Li-ion M18 replacement battery (5S2P, 18650) and a direct replacement for the Milwaukee 48-11-1840 M18 RedLithium XC 4.0 battery, with verified BMS handshake on genuine Milwaukee chargers. Built on a Nuranu proprietary in-house mold for exact OEM fit.

Manufactured by Dongguan Ruineng New Energy (Nuranu) — a high-tech custom battery factory since 2012 — the WK18-XC40 is produced under a fully automated assembly line with 100% aging and end-of-line testing. It is engineered for OEM clients, hardware distributors, and private-label brands that need OEM-equivalent fit and performance at factory-direct pricing.

Milwaukee WK18-XC40 18V 4.0Ah view 1Milwaukee WK18-XC40 18V 4.0Ah view 2Milwaukee WK18-XC40 18V 4.0Ah view 3Milwaukee WK18-XC40 18V 4.0Ah view 4

Compatible Host Tools

  • Milwaukee M18 drills, drivers & grinders
  • M18 RedLithium XC 4.0 tools
  • 48-11-1840 compatible tools

Target Applications

  • Contractor M18 Fleets: The 4.0Ah WK18-XC40 delivers extended runtime for professional M18 drills, grinders, and saws on the jobsite.
  • Rental Fleets: Proprietary-mold shell and OEM-matched latch make it an ideal 48-11-1840 fleet replacement.
  • Private-Label Distributors: Sourced with your branding and carton-ready packaging as a Milwaukee 4Ah Li-ion replacement battery.

Core Technical Advantages

1. Direct 48-11-1840 Replacement

Built on a Nuranu proprietary in-house mold for exact M18 latch geometry — a true drop-in for the Milwaukee 48-11-1840 M18 RedLithium XC 4.0 battery.

2. 4.0Ah 5S2P Architecture

A 5S2P string of Grade-A 18650 cells delivers a genuine 4.0Ah with sustained discharge for high-demand tools.

3. Verified Charger Handshake

BMS handshakes correctly with genuine Milwaukee chargers; behaves identically to the OEM RedLithium XC pack.

Product Video

Factory assembly line, BMS testing, and WK18-XC40 demonstration footage. Contact sales for additional product videos.

Technical Specifications

FeatureSpecification
Replacement ModelWK18-XC40
Compatible BrandMilwaukee (M18 RedLithium)
Nominal Voltage18V
Rated Capacity (real)4.0Ah
Cell Type18650 · 2000mAh
Configuration5S2P
Shell ColorBlack + Red
Proprietary MoldYes (in-house)
Net Weight0.68 kg
Battery Dimensions119*78.5*74.5mm
Inner Box130*90*80mm
Master Carton485*325*230mm
Qty per Carton20 pcs
Carton Net / Gross13.5 kg / 14.1 kg

Packaging & Wholesale Logistics

The WK18-XC40 ships in carton-ready retail packaging engineered for distributor resale and international freight, 20 units per master carton, 14.1 kg gross. Every batch ships with UN38.3 transport test report, IEC 62133 safety certificate, MSDS, and CE Declaration of Conformity for smooth customs clearance in EU, US, UK, AU, and JP markets.

MOQ
100 units (catalog) · 500 units (private label)
Lead Time
25–35 days standard · 18–22 days expedited
Payment
30% T/T deposit + 70% against B/L
Warranty
12 months

Frequently Asked by Distributors

Does the WK18-XC40 replace the Milwaukee 48-11-1840 4Ah Li-ion battery?
Yes. The WK18-XC40 is a direct replacement for the Milwaukee 48-11-1840 M18 RedLithium XC 4.0 battery — a true 4.0Ah 18V Li-ion pack with OEM-matched fit and charger handshake.
What is the MOQ for the WK18-XC40 replacement battery?
Standard MOQ is 100 units for the WK18-XC40. Paid samples of 1–10 units are available for BMS-handshake validation before a production order. Private-label or custom-spec runs start at 500 units.
Is the WK18-XC40 drop-in compatible with original Milwaukee M18 chargers?
Yes. The WK18-XC40 BMS is flashed with M18-specific firmware so it handshakes correctly with genuine Milwaukee chargers — fuel-gauge reporting, authentication, and safety lockouts behave identically to the OEM RedLithium pack. Handshake is validated on 100% of units at end-of-line.
Are these Milwaukee M18 replacement batteries any good?
Yes. Our WK18-XC40 uses Grade-A tier-1 cells (Samsung / LG / Panasonic / BAK), capacity- and resistance-matched, with a BMS validated against genuine Milwaukee chargers on 100% of units. It is built as a professional-grade Milwaukee M18 replacement battery, not a low-cost clone, and is backed by a 12-month warranty.
Will Milwaukee or Home Depot replace my battery — and how is your WK18-XC40 different?
Milwaukee's own warranty covers genuine packs through their service channels. We are an independent factory supplying new WK18-XC40 replacement packs for the M18 platform — a direct, lower-cost alternative when a pack is out of warranty or you need volume supply, with full UN38.3 / IEC 62133 / CE documentation.
Do you replace the cells in my old Milwaukee battery?
We supply complete, ready-to-use WK18-XC40 replacement packs — not a cell-replacement / rebuild service. A new pack with fresh Grade-A cells and a fresh BMS is far more reliable than replacing the cells in an old M18 battery, and ships with full safety documentation.
How do I install the WK18-XC40 M18 replacement battery?
It installs exactly like a genuine Milwaukee M18 pack — slide it onto the tool until it latches, and charge it on any genuine Milwaukee M18 charger. No adapter or modification needed.
What cells and configuration does the WK18-XC40 use?
The WK18-XC40 uses Grade-A 18650 cells (2000mAh each) in a 5S2P configuration for a nominal 18V and a true rated capacity of 4.0Ah. Cells are matched by capacity (±20 mAh) and internal resistance (±5 mΩ) before assembly. Preferred cell brand (Samsung / LG / Panasonic / BAK) can be specified at order.
What is the warranty on the WK18-XC40?
All WK18-XC40 replacement packs carry a 12-month warranty against manufacturing defects. Every batch ships with UN38.3 test report, IEC 62133 certificate, MSDS and CE Declaration of Conformity for smooth customs clearance worldwide.
How is the WK18-XC40 packed for shipping?
The WK18-XC40 ships 20 pcs per master carton (14.1 kg gross), carton dimensions 485*325*230mm. Every batch ships with full UN38.3 / IEC 62133 / CE documentation.

Need a Custom Quote or Technical Details?

Our engineering team is ready to discuss specifications, certification, MOQ, and OEM / private-label customization for the WK18-XC40.

✉ Email Sales 📱 WhatsApp ☎ +86 13823274651

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