Skip to content
TOUGH JOBS DONE RIGHT: Serious Tools Up to 50% Off. Shop the Deals >
Northern Tool Equipment Logo TextNorthern Tool Equipment Logo text link to Home.

Free Gift Card on All Orders Over $100 See Details

Free Gift Card Details

$100 Order
$10
gift card
$250 Order
$25
gift card
$500 Order
$50
gift card
$1000 Order
$100
gift card
  • The promotion will be automatically applied on the Shopping Cart page.
  • To qualify for this offer, your order subtotal must equal $100 or more. Excludes gift cards, free item offers, warranties, Advantage memberships, tax and shipping.
  • Free gift cards will be issued in the form of e-gift cards only, not physical gift cards.
  • E-gift cards will be sent to the email address used in your billing address when your order ships or is picked up.
  • Free e-gift cards expire 10/01/26.
  • Promo code not valid on prior purchases or on Honda and STIHL products and cannot be combined with other promotional offers.
  • Valid online and in participating retail stores.
  • Limited-time offer. Subject to change without notice.
Print

Milwaukee M18 REDLITHIUM XC5.0 Battery, Model# 48-11-1850

Item# 51491
"Milwaukee M18 REDLITHIUM XC5.0 Battery, Model# 48-11-1850"
On Sale
Milwaukee M18 REDLITHIUM XC5.0 Battery, Model# 48-11-1850

This is a carousel with one large zoomable image and a track of thumbnails on the left. Select any of the thumbnail buttons to change the zoomable image on the right. If a thumbnail is a video or 360 degree image thumbnail, or the last thumbnail in the list, the button will open the product media modal.

Milwaukee M18 REDLITHIUM XC5.0 Battery, Model# 48-11-1850

Click or Tap image to Zoom

$99.00
Reg $169.00Save $70.00

Order today to get this price.

  • Offer: FREE Milwaukee M18 XC5.0 Battery with Purchase of a Qualifying M18 Tool See Details

  • Shipping: 

    Free shipping (lower 48 states) - Available now
    $19.99 Same Day

  • Store Pickup: 

    18 in stock at Fredericksburg VA - Pickup in under 1 hr

  • REDLINK™ Intelligence: Provides optimized performance and overload protection using total system communication between tool, battery and charger
  • RedLink Intelligence provides optimized performance and overload protection using total system communication between tool, battery and chargerBest-in-class construction: Offers long-lasting performance and durability
  • All-weather performance: Delivers fade free power in extreme jobsite conditions
  • Fuel gauge onboard: Displays remaining runtime for less downtime on the job
  • Versatility: Powers more than 250+ Milwaukee® M18™ cordless power tools

See full description

Complete Your Solution

  • Milwaukee M18 REDLITHIUM XC5.0 Battery, Model# 48-11-1850
  • Milwaukee M18 FUEL 2-Tool Combo Kit, 1/2in. Hammer Drill/Driver, 1/4in. Hex Impact Driver, 2 Batteries, Charger, Model# 3697-22
  • Ironton High-Dexterity Gloves, 6 Pairs, Black/Red, Large
Price for all three:

$477.99

Frequently Bought Together

  • Description

  • Key Specs

  • Reviews

  • Q & A

  • Accessories

  • Warranty

  • Compare

Product Summary

Our M18™ REDLITHIUM™ XC5.0 Battery delivers up to 2.5X more runtime, 20% more power and 2X more recharges than standard lithium-ion batteries. The lithium-ion battery pack features superior pack construction, electronics, and performance giving you more work per charge and more work over pack life than any battery on the market. The rechargeable battery also offers you 5.0 amp-hours of runtime. Each battery pack is durably built for heavy-duty use, runs cooler, and performs in climates below 0°F/-18°C. This protection routes water away from the electronics and out of the battery pack, extends your battery's run-time and life by minimizing heat, and prevents pack failures from vibration or drops. Built-in REDLINK™ Intelligence protects the battery from overloads, preventing you from damaging your cordless power tools in heavy-duty situations, while the discharge protection prevents cell damage. An integrated temperature management system and individual cell monitoring help to maximize your battery's life. Switch to our REDLITHIUM™ XC5.0 Battery Pack to instantly upgrade the runtime and durability of your Milwaukee M18™ cordless tools.

What's Included

    (1) M18™ REDLITHIUM™ XC5.0 Extended Capacity Battery Pack (48-11-1850)

Downloads

Product Manual Product Manual2
Safety Data Sheet

Over 150 Tools, One Battery

  • Focused on improving productivity for professionals in the trades, MILWAUKEE® offers more than 150 performance-driven solutions that are fully compatible with the M18™ family — the fastest growing 18V cordless system on the market.
  • These tools stand alone, with patented technologies, innovative motors and advanced electronics powered by REDLITHIUM™ battery technology for unmatched run-time.

Performance-Driven M18™ Technology

  • The MILWAUKEE® M18™ cordless system represents the ultimate synergy of professional grade power, light weight, extreme performance and superior ergonomics.
  • Powered by REDLITHIUM™ battery technology for unmatched run-time, and coupled with patented technologies, innovative motors and advanced electronics, M18™ changes the game.
  • Whether it's bringing cordless power to traditional corded products and manual activities or advances to fundamental tools, MILWAUKEE® drives to improve workplace productivity with user-driven innovations.

Shop With Confidence

  • MILWAUKEE ® provides the best in heavy-duty electric power tools and accessories.
  • Your purchase is protected with a 5-year limited warranty on cordless tools, a 2-year limited warranty on compact batteries, and a 3-year limited warranty on XC batteries.
  • Shop in complete confidence, knowing that Northern Tool + Equipment protects your investment and is ready to provide you with the assistance and helpful resources you need.

Features + Benefits

  • REDLINK™ Intelligence: Provides optimized performance and overload protection using total system communication between tool, battery and charger
  • RedLink Intelligence provides optimized performance and overload protection using total system communication between tool, battery and chargerBest-in-class construction: Offers long-lasting performance and durability
  • All-weather performance: Delivers fade free power in extreme jobsite conditions
  • Fuel gauge onboard: Displays remaining runtime for less downtime on the job
  • Versatility: Powers more than 250+ Milwaukee® M18™ cordless power tools
  • 3 year battery warranty

Key Specs

AttributeSpecification

item#

51491

Brand

Milwaukee

Manufacturer's Warranty

3 year limited warranty

Ship Weight

1.91 LB

Volts

18

Battery Type

Lithium-ion
AttributeSpecification

Batteries (qty.)

1

Battery Capacity

5 A·h

Product Type

Battery

For Use With

Power Tools Regular

Storage Type

None

Reviews

Questions & Answers

194 Reviews This action will navigate to reviews.

Questions

1–6 of 6 Questions  
Sort by:

  1. How much is the charger for this M18 Redlithium XC5.0 battery?

    1 answer

    1. Please see item 32665 for a charger option.

      Helpful?

  2. Is the M12 M18 charger sufficient to charge the M5.0 battery.

    1 answer

    1. Yes, the M12-M18 charger is suitable for charging the 5.0Ah battery. Please view charger item 32665.

      Helpful?

  3. Which battery is the best, longest life, more power. battery item #62594 or item # 51491?

    1 answer

    1. Item 62594 is two XC 5.0 batteries, item 51491 is one XC 5.0 battery. They have the same power output and life.

      Helpful?

  4. is this battery to strong for the 15ga finish nailer

    1 answer

    1. This battery would be compatible with the M18 finish nailers.

      Helpful?

  5. Does this battery replace the 48-11-1865 M18 LI-ION battery

    1 answer

    1. The batteries can be used for the same tools. The 48-11-1865 would list a higher 6.0-amp hour rating

      Helpful?

  6. Where is the battery made?

    1 answer

    1. The battery would be made in China.

      Helpful?

Accessories We Recommend

This is a carousel with auto-rotating slides. Activate any of the buttons to disable rotation. Use Next and Previous buttons to navigate, or jump to a slide with the slide dots.

See All Power Tool Batteries + Chargers
Milwaukee M18 REDLITHIUM XC5.0 Battery, Model# 48-11-1850
4.3 out of 5 stars. 194 reviews

Milwaukee M18 REDLITHIUM XC5.0 Battery, Model# 48-11-1850

Item # 51491

$99.00
Reg $169.00Save $70.00

Order today to get this price.

See All Modular Tool Storage Systems
Milwaukee PACKOUT M18 Battery Rack, Model# 48-22-8339
4.6 out of 5 stars. 16 reviews

Milwaukee PACKOUT M18 Battery Rack, Model# 48-22-8339

Item # 112822

$24.98

Warranty

Manufacturer's Warranty

3 year limited warranty

Recently Viewed Items

This is a carousel with auto-rotating slides. Activate any of the buttons to disable rotation. Use Next and Previous buttons to navigate, or jump to a slide with the slide dots.

Milwaukee M18 REDLITHIUM XC5.0 Battery, Model# 48-11-1850
4.3 out of 5 stars. 194 reviews

Milwaukee M18 REDLITHIUM XC5.0 Battery, Model# 48-11-1850

Item # 51491

$99.00
Reg $169.00Save $70.00

Order today to get this price.