Key Features
Overview
The Milwaukee 48-11-1855 M18 REDLITHIUM HIGH OUTPUT XC5 Battery is a cordless tool battery designed for pros running heavy-draw M18 tools all day and needing more punch than a standard XC pack delivers. Model number 48-11-1855, this 5.0 amp-hour pack slots straight into any M18 tool or charger you already own.
It delivers 50% more power than the standard REDLITHIUM XC5.0, landing at PWR Level 3 on Milwaukee’s REDLITHIUM Power scale. That translates to less bogging down on hammer drills, impact wrenches, and saws that pull hard current. The fuel gauge button has been reworked too — bigger feel, easier press, faster read — so checking charge state on the jobsite doesn’t mean squinting or guessing.
Build quality got the same attention as output. The pack construction routes water away from the internal electronics and out of the housing, cuts down on heat buildup that shortens battery life, and is built to shrug off drops and vibration instead of failing from them. REDLINK Intelligence runs the show behind the scenes, keeping constant communication between tool, battery, and charger so the pack protects itself from overload without you thinking about it.
Because it’s part of the M18 platform, this battery is fully compatible with 300+ M18 solutions — meaning it’s not locked to one tool. Buy it once, run it across your whole M18 lineup.
This is the pack to reach for if you’re running your M18 tools hard, every day, and you’re tired of a standard XC5.0 losing steam before the job’s done. It’s a straightforward upgrade: same platform, more usable power.
Power That Doesn’t Fade
Standard XC batteries can fade under high-draw tools right when you need consistent power the most. The HIGH OUTPUT XC5 pack was built to close that gap.
- 50% more power than REDLITHIUM XC5.0
- PWR Level 3 on the M18 REDLITHIUM Power scale
- 5.0Ah runtime balances power, size, and weight
Built to Survive the Jobsite
The redesigned pack construction is built for the realities of a jobsite, not a showroom shelf.
- Routes water away from internal electronics and out of the pack
- Minimizes heat buildup to extend runtime and overall battery life
- Resists failures from vibration and drops
One Battery, the Whole M18 Lineup
You’re not buying a battery for one tool — you’re buying into a system.
- Fully compatible with 300+ M18 solutions
- Works on any M18 charger, standard or rapid
- REDLINK Intelligence coordinates tool, battery, and charger communication
What’s in the Box
- (1) M18 REDLITHIUM HIGH OUTPUT XC5 Battery Pack
Charger and M18 tools are sold separately — this listing is for the battery pack only.
Key Specifications
| Battery Voltage | 18V |
|---|---|
| Amp Hour Capacity | 5.0 Ah |
| Battery Line | REDLITHIUM HIGH OUTPUT |
| Power Level | PWR3 (M18 REDLITHIUM Power Scale) |
| Battery Family | Milwaukee M18 |
| Height | 6.77 in |
| Width | 6.22 in |
| Depth | 3.15 in |
| Weight | 1.72 lbs |
| Warranty | 3 Year Limited Warranty |
| Country of Origin | Korea (Republic of) |
Compatibility
Built For
Pro Tip
Hit the fuel gauge button before you pull a battery off the charging rack, not after you’re already up the ladder. The upgraded button gives a faster, more accurate readout so you know which pack has enough juice for the next task.
Warranty & Support
Tool Nut’s Take
The Battery to Grab When Standard XC5.0 Isn’t Enough
This is the pack for anyone running M18 tools that pull hard current and don’t get a break during the day.
- Who it’s for: Pros running high-draw M18 tools — impact wrenches, hammer drills, saws — through a full shift.
- Why it stands out: 50% more power than standard REDLITHIUM XC5.0 in a pack sized for everyday carry, plus an upgraded fuel gauge you can actually read fast.
- Worth knowing: Battery only — charger and tools sold separately. If your work involves oil, grease, or solvent exposure, look at the Resistant version (48-11-1855R) instead.
Common Questions
- Will this fit my M18 tools? Yes — it’s built for the M18 system and works with every M18 tool and charger, 300+ solutions and counting.
- What’s the difference between this and the Resistant version (48-11-1855R)? Same 5.0Ah HIGH OUTPUT cell and power output. The 48-11-1855R adds a resistant housing built to handle oils, greases, and solvents for shop and automotive environments.
- Does it come with a charger? No — this listing is for the battery pack only. Charger and tools are sold separately.
- How long is the warranty? 3 Year Limited Warranty on the battery pack.
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