Milwaukee WK18-XC40 M18 18V 4.0Ah Replacement Battery
- Direct replacement for the Milwaukee 48-11-1840 M18 RedLithium XC 4.0 battery.
- True 4.0Ah, 18V Li-ion battery with a 5S2P 18650 cell configuration.
- Verified BMS handshake on genuine Milwaukee chargers and an exact OEM-fit in-house mold.
- Retail-ready packaging, 20 units per master carton, with UN38.3, IEC 62133, MSDS, and CE documents included.
This is a 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. It has verified BMS handshake on genuine Milwaukee chargers. It’s built on a Nuranu proprietary in-house mold for exact OEM fit.
Dongguan Ruineng New Energy (Nuranu) — a high-tech custom battery factory since 2012 — manufactures the WK18-XC40. It’s produced under a fully automated assembly line with 100% aging and end-of-line testing. It’s designed for OEM clients, hardware distributors, and private-label brands that need the same fit and performance as OEM products at factory-direct prices.
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.
Technical Specifications
| Feature | Specification |
|---|---|
| Replacement Model | WK18-XC40 |
| Compatible Brand | Milwaukee (M18 RedLithium) |
| Nominal Voltage | 18V |
| Rated Capacity (real) | 4.0Ah |
| Cell Type | 18650 · 2000mAh |
| Configuration | 5S2P |
| Shell Color | Black + Red |
| Proprietary Mold | Yes (in-house) |
| Net Weight | 0.68 kg |
| Battery Dimensions | 119*78.5*74.5mm |
| Inner Box | 130*90*80mm |
| Master Carton | 485*325*230mm |
| Qty per Carton | 20 pcs |
| Carton Net / Gross | 13.5 kg / 14.1 kg |
Packaging & Wholesale Logistics
The WK18-XC40 is shipped in a carton-ready retail package that’s designed for distributor resale and international shipping. Each master carton contains 20 units, with a total weight of 14.1 kg. Every batch ships with UN38.3 transport test report, IEC 62133 safety certificate, MSDS, and CE Declaration of Conformity so you can get through customs easily in the EU, US, UK, AU, and JP markets.
| Item | Details |
|---|---|
| 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 |
Product Video
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. It is a true 4.0Ah 18V Li-ion pack that fits OEM-matched Milwaukee batteries and chargers.
What is the MOQ for the WK18-XC40 replacement battery?
The standard MOQ is 100 units for the WK18-XC40. You can get paid samples of 1–10 units to check the BMS-handshake before placing an 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 has M18-specific software, so it works correctly with Milwaukee chargers. It also has the same fuel-gauge reporting, authentication, and safety lockouts as the OEM RedLithium pack. Handshake is validated on 100% of units at the end of the line.
Are these Milwaukee M18 replacement batteries any good?
Yes. Our WK18-XC40 uses Grade-A tier-1 cells (Samsung, LG, Panasonic, and BAK), which are capacity- and resistance-matched, and the BMS has been validated against genuine Milwaukee chargers on 100% of units. It’s made as a professional-grade Milwaukee M18 replacement battery, not a low-cost clone, and it’s got a 12-month warranty.
Will Milwaukee or Home Depot replace my battery — and how is your WK18-XC40 different?
Milwaukee’s warranty covers genuine packs through their service channels. We’re an independent factory that supplies new WK18-XC40 replacement packs for the M18 platform. These packs are a great, low-cost option when a pack is out of warranty or you need a large supply. They’ve got all the necessary UN38.3 / IEC 62133 / CE documentation, too.
Do you replace the cells in my old Milwaukee battery?
We supply complete, ready-to-use WK18-XC40 replacement packs — we don’t offer cell replacement or rebuild services. 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 it comes with full safety documents.
How do I install the WK18-XC40 M18 replacement battery?
It installs just like a real Milwaukee M18 pack. All you have to do is slide it onto the tool until it latches, and then charge it on any real Milwaukee M18 charger. You don’t need to change it or buy an adapter.
What cells and configuration does the WK18-XC40 use?
The WK18-XC40 uses high-quality 18650 cells (2000mAh each) arranged in a 5S2P configuration, providing a nominal 18V and a true rated capacity of 4.0Ah. Before assembly, cells are matched based on their capacity (±20 mAh) and internal resistance (±5 mΩ). You can specify your preferred cell brand (Samsung, LG, Panasonic, or BAK) when you place your order.
What is the warranty on the WK18-XC40?
All WK18-XC40 replacement packs come with a 12-month warranty that covers manufacturing defects. Every batch of products is shipped with the following documents:
– UN38.3 test report
– IEC 62133 certificate
– MSDS
– CE Declaration of Conformity
These documents are needed to clear customs worldwide.
How is the WK18-XC40 packed for shipping?
The WK18-XC40 is shipped in master cartons of 20 pieces (14.1 kg gross). The carton dimensions are 485*325*230 mm. Every batch of these products has the necessary UN38.3 / IEC 62133 / CE documents.