The battery in LF2 is a very small Lithium Ion battery for the remote. The battery falls outside of the scope of a "Dangerous Good or HazMat shipment" due to its small size. The wattage is below 20, it is 3.7Wh.
For a replacement battery, we recommend this one on amazon.
Here is a copy of the MSDS (Material Safety Data Sheet) for your reference: