Hey Doggy,
Your battery is dead because you leave it on the optimate constantly. Batteries don't like that. It is better to have the battery on the charger for like a weekend and then of for like 2 a 3 weeks.
The problem is that the battery has enough voltage, but the amperehours get low. You need the voltage to run the electrics/ECU and you need the aH to start your bike.
Don't search too far for the problem. Just keep the optimate of the bike during the riding season and replace the battery.
A good battery last +/- 5 years. Depending on how good you service it. Sometimes more, sometimes a bit less.
Tim.
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