All types of batteries, by default, only have a 6 Months warranty of the purchase date.
General Battery Warranty Terms and Battery Support Terms:
The battery warranty and Battery Support only covers failures resulting from defects in materials or workmanship.
The warranty does not cover the following:
Decrease in capacity that occurs over time and with use of the batteries.
Failure or diminished capacity resulting from accidents, misuse, abuse, contamination, or other external causes.
Failure or diminished capacity resulting from improper calibration.
Failure or diminished capacity resulting improper or inadequate maintenance.
Battery life expectancy varies depends on product configuration and usage, including but not limited to product model, applications running, power management settings, and product features.
NOTE:
You may be required to return the battery and run a diagnostic test to determine if a battery failure is covered by the warranty.