Honeywell Marathon Reference Manual page 3

Li-Ion Battery
When disposing of the lithium-ion battery, the following precautions should be observed: The battery should be disposed of
properly. The battery should not be disassembled or crushed. The battery should not be heated above 212°F (100°C) or
incinerated.
CAUTION - RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE.
DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS.