after 9 years of faithfull service despite some abuse, The OEM battery was occasionally lazy to turn the engine.
Monitored the voltage drop from fully charged, it went from 13 to 12.5v (and remained there) within 3 days.


Now 12.5v looks healthy but it poitend to the battery having lost some capacity.


I finally decided to take it to the shop for a cranking test. The poor thing was giving out 75A (120A when new!) but was still starting the engine (although not with ease).


I was impressed how unfussy the engine is when is comes to battery power. So unlike my other bike which would not start if the battery power drops by more than 20%!