Shipping Pickup & Returns
Shipping Free regular shipping over $49 on select items, or $10 flat rate. Does not apply to items identified as oversized items, or shipping locations in NL, NU, NT, or YT. For more information and exceptions, please refer to our Shipping Policy.
Warehouse Pickup Same day pickup is available for orders placed on weekdays before 1:30PM . For orders placed after 1:30PM, pickup will be available the next business day. For more information and exceptions, please refer to our Warehouse Pickup Policy.
Returns & RefundYou can return a product for up to 30 days following the date you purchased it. For more information and exceptions, please refer to our Return/Refund Policy.
Milwaukee M18 Battery Comparison: Standard High Demand And High Output
Before we start looking at the Milwaukee M18 batteries compared in detail, lets sort out the High Demand and High Output designations.
Milwaukee High Demand batteries were the first advancement out from their standard packs. It provides a 35% power boost while running up to 60% cooler and still using 18650 cells with some pack upgrades.
High Output batteries are a more comprehensive upgrade with 21700 cells and new battery, tool, and charger electronics. They work in any Milwaukee M18 or M18 Fuel tool, but tools with the new electronics get up to a 50% power boost. The battery runs 50% cooler than standard packs and these batteries take advantage of the new Super Chargers lightning-fast charging times.
Check out our Milwaukee battery warranty article to understand how long Milwaukee covers each of these batteries for service and replacement.
M18 Redlithium Cp20 Battery
Our M18 REDLITHIUM CP2.0 Battery delivers up to 2X 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 2.0 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. Its compact, lightweight design allows you to work in tight work spaces and reduces fatigue. 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 CP2.0 Compact Battery Pack to instantly upgrade the runtime and durability of your Milwaukee M18 cordless tools.
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Milwaukee M18 Redlithium Cp20 Battery
Features:
- Provides optimized performance and overload protection using total system communication between tool, battery and charger
- Displays remaining runtime for less downtime on the job
- Offers long-lasting performance and durability
- Delivers fade-free power in extreme jobsite conditions
The M18 REDLITHIUM CP2.0 Battery delivers up to two times more runtime, 20% more power and two times more recharge than standard lithium-ion batteries. The lithium-ion battery pack features a rugged exterior for longevity. The rechargeable battery also offers you 2.0 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. Its compact, lightweight design allows you to work in tight workspaces and reduces fatigue. An integrated temperature management system and individual cell monitoring help to maximize your battery’s life. Switch to our REDLITHIUM CP2.0 Compact Battery Pack to instantly upgrade the runtime and durability of your Milwaukee M18 cordless tools.
Specs
Milwaukee M18 Battery: Redlithium

For the M18 lineup, weve given you the option to buy everything we have in our store, right here on this page. I spent weeks finding exactly which tools you should put in your cabinet, and the same applies to batteries.
First, youll want to decide which batteries you need.
CP batteries are the lightest and most compact.
XC battery packs, or extended capacity, are for your mid sized tools. M18 XC batteries can provide tools a boost in performance, if only by a little bit.
HD battery packs, or High Demand are for the longest use times, and run less hot. This is for stuff like table saws, miter saws, etc.
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M18 Redlithium High Output Hd120 Battery Pack
The M18 REDLITHIUM HIGH OUTPUT HD12.0 Battery Pack provides 50% more power and runs 50% cooler vs M18 REDLITHIUM HD battery packs. The massive increase in power elevates the performance of the entire M18 system and drives the next breakthrough in M18 FUEL, delivering the power of 15A corded product. It delivers fade free power and runs substantially cooler through heavy applications, allowing tradesmen to push their cordless tools harder and longer than ever before. The M18 REDLITHIUM HIGH OUTPUT HD12.0 is the best performing cold weather pack ever made, providing increased power in extreme cold weather conditions . It provides the most work per charge of any professional power tool battery in the industry, driving full corded replacement on the jobsite. The REDLITHIUM HIGH OUTPUT HD12.0 battery is fully compatible with 150+ M18 solutions.