Alarm Mode is the main factor that drains the battery. With this in mind - you don't want to have many false alarms. In other words, avoid moving the Monimoto when the KEY is away. New batteries are enough up to 500 locations. 

Monimoto KEY

In general, any kind of motion or vibration drains the KEY battery. The lowest energy consumption is observed when motorcycle is not moving and the KEY is not around. When the KEY is around, Monimoto connects with it and the energy consumption increases compared to the conditions when KEY is not around.