I'm going to slap this up here before I dig in - hoping its a common one.

Bike idle all winter and summer up to this point. Starter relay chatters rapidly on key turn. Starter or Engine doesn't move.
Dash and indicator lights remains brightly lit. Boost has same effect.

thanks

[2015 Z Force 800 53/Trail EPS]

The relay...or the solenoid? In most systems the key switch sends power to the relay and closed. That sends power to the solenoid's coil. The solenoid then closes and sends power to the starter motor. IF..the solenoid just clicks it usually means there isn't enough power to close the contacts..or the load, meaning the starter motor itself is locked up..and CFMs do with rust as their motors are not water proof, or there is a poor or bad ground on the solenoid's coil. If you are not keeping your battery on a maintainer, and you haven't fully charged it every month, it's likely that battery is gone. Charge it and have it load tested. While there clean and inspect all the leads and cables. You can test the starter motor by jumpering direct 12volt power to the one post you see. If it rotates the engine, you know it's OK.

It was the battery NMK .... thank you.

Funny I boosted it with a couple Canadian Tire hand held boosters. When I used my truck boost it started.
I then sourced a real tester and it sucked down to 7 volts (BAD).

Now I have a sudden curiosity. And I'm going to use the word "slap" again ... (:
Could any battery, within reason, with the correct voltage and ah, be slapped in ANY machine as
long as it nicely fits and has compatible connections?

thanks

[2015 Z Force 800 53/Trail EPS]

It was the battery NMK .... thank you.

Funny I boosted it with a couple Canadian Tire hand held boosters. When I used my truck boost it started.
I then sourced a real tester and it sucked down to 7 volts (BAD).

Now I have a sudden curiosity. And I'm going to use the word "slap" again ... (:
Could any battery, within reason, with the correct voltage and ah, be slapped in ANY machine as
long as it nicely fits and has compatible connections?

thanks

Well it needs to have the correct CCAs and AHs to operate in the unit. It an have more...just not less. It also needs to fit.