Is this a genuine Milwaukee product? Some are saying it is not.

Yes it is. Our product are 100% brand new and are genuine Milwaukee battery. We buy in bulk quantity so sometimes it does not come in original packaging. But I can assure you they are 100% brand new and are from Milwaukee.

Does this work for a Milwaukee lantern? If so, how long will it last before before it needs to be charged?

(Yes and that depends) Yes it works with 2 types of M12 lights (1. M12 LED Stick Light 2351-20) and (2. M12 LED Lantern/Flood Light 2362-20) Now you said Lantern so i'm guessing you mean the 2362-20 which has Four Light Settings: High, Medium, Low, Strobe. Run times are base on the XC 4.0 Extended Capacity Battery Pack. Low 67 Lumens 67 Hrs Run Time, Medium 200 Lumens 15 Hrs Run Time and High 400 Lumens 8 Hrs Run Time. Hope this Helps Good Luck. :)

Will this battery really increase the power of my tools? Specifically the M12 5/8" cordless circular saw.

Under heavy load yes the larger capacity allows the tool to draw more amperage resulting in slightly more power without stalling out the blade.

Don't this battery fits on milwaukee mlw255721 3/8 inch m12 fuel ratchet auto kit ?

As far as I know, all of the M12 batteries are interchangeable. We have 1 tool with 3 different size batteries. We use this tool in our business and have run it hard for over a year with no problems...

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Milwaukee 48-11-2440 M12 REDLITHIUM XC 4.0 Extended Capacity Battery Pack

Product ID: 265765698

Details

Battery capacity
4400
Battery cell composition
Lithium Ion
Brand
Milwaukee
Number of batteries
1 Lithium Ion
Recommended uses for product
Power Tool

⚡12V High-Performance Power

🔋4.0Ah Extended Capacity

🛠️Lightweight 404g Design

Description

🔋 Power up your productivity with Milwaukee’s unstoppable M12 REDLITHIUM XC!

COMPACT YET MIGHTY - Weighing just 404 grams, this battery packs serious power without weighing you down on the job.
READY OUT OF THE BOX - Includes one lithium-ion battery—no extra purchases needed to get started immediately.
BUILT FOR PROFESSIONALS - Engineered by Milwaukee Electric Tool, trusted by pros who demand durability and efficiency.
POWER THAT LASTS LONGER - 4.0Ah REDLITHIUM XC battery delivers extended runtime to keep your projects moving without interruption.
OPTIMIZED VOLTAGE FOR PEAK PERFORMANCE - 12V power source ensures consistent, reliable energy for all your Milwaukee M12 tools.

The Milwaukee 48-11-2440 M12 REDLITHIUM XC 4.0 Extended Capacity Battery Pack is a lightweight, high-capacity 12V lithium-ion battery designed to deliver longer runtime and reliable power for Milwaukee M12 cordless tools. Weighing just 404 grams, it combines portability with professional-grade performance, making it an essential upgrade for any serious tradesperson.

Specifications

ASIN	B00BYFO1AA
Amperage	4 Amps
Antenna Location	Power Tool
Battery Capacity	4400
Battery Cell Type	Lithium Ion
Battery Weight	29 Grams
Best Sellers Rank	#125,193 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #439 in Cordless Tool Accessories #1,215 in Outdoor Power Tool Accessories
Brand	Milwaukee
Compatible Phone Models	All M12 tools
Customer Reviews	4.7 4.7 out of 5 stars (3,542)
External Testing Certification	Não aplicável
Global Trade Identification Number	00045242293278
Item Dimensions	10.2 x 4.4 x 14.7 centimeters
Manufacturer	Milwaukee
Model Number	48-11-2440
Number of Batteries	1 Lithium Ion batteries required. (included)
Reusability	Rechargeable
UPC	045242293278
Unit Count	1.0 Count
Voltage	12 Volts

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