The Milwaukee 48-11-1850 is Milwaukee’s M18 REDLITHIUM XC 5.0 Ah battery — the best-selling balance of runtime and weight in the M18 lineup. Compatible with all 200+ tools in the Milwaukee M18 platform, it is the battery most commonly included in M18 combo kits and is the go-to choice for professional tradespeople.
48-11-1850 Specifications
| Specification | Value |
|---|---|
| Part Number | 48-11-1850 |
| Brand Name | M18 REDLITHIUM XC 5.0 |
| Voltage | 18V |
| Capacity | 5.0 Ah |
| Chemistry | Lithium-ion (REDLITHIUM) |
| Cells | 10 cells |
| Weight | 595 g / 1.31 lbs |
| Technology | REDLITHIUM (temperature management, cell protection) |
| Platform | Milwaukee M18 |
| Charge Time (M18 C) | Approx. 50 min |
Platform Compatibility
The 48-11-1850 is compatible with all tools in the Milwaukee M18 system — over 200 tools covering drills, saws, grinders, rotary hammers, nailers, outdoor equipment, and specialty trade tools. It works with both standard M18 and M18 FUEL brushless tools. It is not compatible with Milwaukee M12 tools.
Compatible M18 Battery Models
| Battery Model | Capacity | Compatible |
|---|---|---|
| 48-11-1815 | 1.5 Ah (CP) | ✅ Yes |
| 48-11-1820 | 2.0 Ah (CP) | ✅ Yes |
| 48-11-1828 | 2.8 Ah (CP) | ✅ Yes |
| 48-11-1840 | 4.0 Ah (XC) | ✅ Yes |
| 48-11-1850 | 5.0 Ah (XC) | ✅ Yes (this battery) |
| 48-11-1860 | 6.0 Ah (HO) | ✅ Yes |
| 48-11-1862 | 6.0 Ah (FORGE) | ✅ Yes |
48-11-1850 vs 48-11-1860 — Which Should You Buy?
The 48-11-1850 (5.0 Ah) is approximately 10% lighter than the 48-11-1860 (6.0 Ah) while offering around 80% of the runtime. For most trade use — framing, finishing, electrical, plumbing — the 48-11-1850 is the practical choice and charges faster. The 48-11-1860 is preferred for sustained high-draw use: large angle grinders, SDS-Max rotary hammers, or extended chainsaw and mower use.
Replacement Battery Options
Genuine Milwaukee 48-11-1850 replacements are the most widely stocked M18 battery and are available from all Milwaukee authorised dealers. Compatible third-party M18 5.0 Ah batteries are available from several brands. Verify compatibility with your specific tool models, particularly M18 FUEL tools.
Specifications reflect standard production variants. Always verify compatibility with your specific tool model before purchase. For the most current product information, visit the manufacturer’s official website.