I'd recommend you get one of these:
It's a pretty cool tool that you just leave connected to your battery on the bike and an app on your phone monitors the battery over time. It'll tell you how quickly the battery is decaying and can tell you if your charging system is working correctly when the bike is running. I agree with the previous posts though that your battery is definitely not in good shape right now. Perhaps it's possible to recover it, but anything below 12.0V is by definition a completely dead battery. Do you have a battery charger you can hook up to your battery to try and charge it off the bike?