
I put a new Yuasa YTZ14S on a couple of weeks ago. It's performed perfectly until today - starting great. The bike has a Datatool alarm on, so I've been checking the battery by attaching the charger regularly. It's been spot on. However, the alarm did go off yesterday and the battery was a bit down this morning. I charged it back up, but it's not working correctly. I'm getting some turn over, but it goes to the buzzing noise fairly quickly. It would appear the battery has lost it's power already. Could the alarm have killed the battery so soon? I understand a battery won't fully recover if it goes under 40% charge, but I don't think mine's been that low. Perhaps the buzzing noise indicates a problem with the bike, but it only ever does it when a battery gets weak. Could it be a faulty battery?