Join Date: Oct 2018
Location: New Brunswick, Canada
Also bear in mind that any lead acid battery will self-discharge over time. Some will go flat in as little as 100 days. That's why a trickle charger is your battery's best friend.
The time it takes to go flat depends on a lot of factors like condition of battery, type of battery, temperature and of course any load on the battery (intentional or parasitic). If your bike has a computer or a clock etc, there will be a small but constant draw on the battery.
If you ride on regular basis you should not have to worry about a trickle charger.