Will this fit a Alienware 15r3?

It should, but the lead may not be long enough. I had this problem with a M17r3 but I was able to tuck it in another area and it worked.

Will this work on an Alienware X51?

No, this one is not compatible. Please search for item B08NZVFQRJ

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Rome Tech CMOS Battery for Dell Alienware M11x, M11x R2, M11x R3, M14x, M14x R2 - Backup BIOS RTC 3V CR2032 with 2 Pin 2 Wire Cable

Product ID: 244567848

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Details

Number of Batteries
1 CR2032
Brand
Rome Tech
Battery Cell Composition
Lithium Ion
Battery Capacity
225 Milliamp
Recommended Uses For Product
Laptop

⚡Quick Install

🔋3V Power

🛠️Premium Quality

Description

🔧 Power Up Your Alienware with Ease!

RELIABLE POWER SOURCE - Ensure your Dell Alienware stays powered with our long-lasting CR2032 battery.
CUSTOMER SUPPORT READY - Our dedicated team is here to assist you with any installation queries.
EFFORTLESS INSTALLATION - Replace your old battery in just 10 minutes—no tech skills required!
UNIVERSAL COMPATIBILITY - Fits a range of Dell Alienware models for seamless integration.
HIGH QUALITY CONSTRUCTION - Engineered with heat shrink technology for enhanced durability.

The Rome Tech CMOS Battery is a reliable 3V CR2032 replacement designed specifically for various Dell Alienware models. With a compact size and easy installation process, this premium battery ensures your device remains operational without hassle. Enjoy long-lasting performance and dedicated customer support for a seamless experience.

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