Documents & Guides
Everything you need for key fob battery replacement — how to change the battery, what size fits your remote, troubleshooting tips, and vehicle-specific battery lookups.
Battery Guides
Battery Size Guide
Complete guide to car key fob battery sizes. Compare CR1616, CR1620, CR1632, CR2016, CR2025, CR2032, CR2354, and CR2450 batteries with dimensions, voltage, and capacity information.
View Guide →CR2032 vs CR2025
Compare CR2032 and CR2025 batteries to understand the differences, similarities, and which one is right for your vehicle.
View Comparison →Safety
Battery Safety
Critical safety information about button cell batteries. Learn about dangers, proper handling, emergency procedures, and important hotline numbers from the U.S. Consumer Product Safety Commission.
View Safety Guide →Replacement & Troubleshooting
How to Replace Car Key Battery
Step-by-step instructions for replacing your car key fob battery. Learn how to open the fob, swap the coin cell, and get your remote working again.
View Instructions →Common Car Key Battery Problems
Key fob not working? Learn about dead batteries, reduced range, wrong battery size, and how to troubleshoot effectively.
View Guide →By Vehicle Make
Find key fob battery sizes and replacement info for popular brands.
