The battery type we use for Chipolo Classic and older models is CR2025, often referred to as button battery or watch battery. These batteries in the Chipolo Classic and older models are replaceable.
In the Chipolo Plus we use a CR2032 battery which lasts one year guaranteed. Please don't open the Chipolo Plus as the battery is NOT replaceable. If your Chipolo Plus didn't make it a full year, contact us via chipolo.net/support and we will replace your Chipolo Plus under warranty.