Why would a wrist watch lose power just weeks after replacing the battery?
CR2025 is just the physical size of the battery, but you have many different types of batteries: lithium, alkaline, etc.
Lithium itself has different chemistry as well, some batteries are also designed for higher current delivery or low self-discharge, and so forth.
Also, there is a lot of &quot;fake&quot; or &quot;old&quot; batteries. The battery you got probably was of bad quality, old or defective.
When getting the battery, make sure to order from a reliable source (not eBay, not amazon) and check the capacity (mAh) and make sure it's a low self-discharge battery.