BMW R1200R R1150R/T F800 K1200R R1100R/T R1250R RnineT Message Board

My battery is 2 yo (maintenance-free). haven't ridden the bike in 2 months. Ignition on, get the lights on and indicators moving, all OK, but the engine won't start. Ignition off and put the battery on re-charge (through bike's 12V power outlet) for 3 days. Battery charger led green (full charge). Ignition on, nothing but a violent quick rattle fromn down below.
Could someone enlighten me? With this economy everything I could do myself helps a lot.
Thank you.

That 'rattle' could be the starter solenoid which engages and disengages the starter gear. If the voltage is too low, this will happen three or four times per second, which sounds like a rattle. Even though you've recharged it, and it's only two years old, I'd still suspect the battery. Do you hear the fuel pump whine on for a few seconds after you turn the key?

NoRRmad, thank you for the quick reply. No fuel pump whine, but a clean, very conspicuous rattle, which also seems to fade away/diminish in volume as the power dissipates.
I will replace the battery, keeping my fingers crossed.
Then a paint job will be next since the bike, even if garaged and kept clean and dry throughout its' life, is losing its'as tank paint; down to the whitish primer.
After the paint job, bike will be sold and replaced by a Honda Goldwing.

It could also be a poor connection at the battery terminals. I've seen that often enough on automobiles. But the absence of fuel pump whine makes me suspect weak battery.

Yep, replaced the battery and runs like a dream. Paint job next.