So what's your voltage readings?
Claiming a battery is 'only' 2.5 years old doesn't mean it's not shot.
you obviously have something going on with your battery, charging system or a drain somewhere, so you need to check the voltages as in my first post.
Check before you start it and see if it's ok around 12v, with bike running (should be around 14v) and then turn bike off and see what battery voltage is and if the voltage drops quickly.
Try this also with the ignition on but engine off and see if it can't maintain a charge.
Could be something else, but this is such a basic check it should have been the first thing to try.
Claiming a battery is 'only' 2.5 years old doesn't mean it's not shot.
you obviously have something going on with your battery, charging system or a drain somewhere, so you need to check the voltages as in my first post.
Check before you start it and see if it's ok around 12v, with bike running (should be around 14v) and then turn bike off and see what battery voltage is and if the voltage drops quickly.
Try this also with the ignition on but engine off and see if it can't maintain a charge.
Could be something else, but this is such a basic check it should have been the first thing to try.