What type of battery is used for the Canon EF Adapter XL for Canon XL-2 and XL-1 DV Camcorders

The second link when I Google "Canon EF Adapter XL manual" brings up this (the first one was in Japanese, which I don't read), which, on page 12, under "Replacing the lithium battery", mentions that the battery is a "2CR5". Googling "2CR5 battery" comes up with many links for where you can get them - Walgreens, Grainger, Amazon, Best Buy, ....... Most of them also give details - like it's a 6V rechargeable lithium battery.