Hey everyone. My bike started making new sounds, which is rarely a good thing. It's a kind of rattle that increases with RPM. Cam chain tension is at 7 clicks. Bike has 9k kilometers of the current cam chain. Here's a video of the sound
Found the cause. The rubber band keeping the battery tight has become brittle. The strong vibrations from the engine made it slap against its containers, perfectly in synch with RPM. Replaced it, no more rattling.
