I think your battery is on the way out. The charging voltage is reasonable, so I don't suspect an alternator problem. But the resting voltage of the battery is quite low - should be closer to 13 volts for a fully charged lead-acid battery. From a quick google scan on battery information it appears your battery is less then 30% charged and the voltage is low enough that sulfation of the lead plates is occuring, which over time destroys the battery. Try a google search using terms like: lead acid battery voltage charge state.

- JimY