99 GS500. Pulled battery (5+ years old) out for the winter. Periodically trickle charged it. Battery tested within range (~12.5V) when on bike and off. Hook up to bike...nothing. No power at all. I do get a rotten egg smell and a battery getting very hot. I'm replacing that battery today. Bike was fine went put away last October. Is there anything else I should consider? thanks
Sounds like you have a short somewhere.
Google "Motorcycle battery testing". Any good procedure will have a step to check and see if there is a short.