There are quite a number of problems reported on the Ampera forum which seem to be down to a battery on it's way out (biut not yet dead). These manifest (usually) as spurious fault codes which are worrying but sometimes clear the next time it's started.
The forum recommendation is to change the 12v every three years or thereabouts, which isn't a huge cost if you can diy.
Mine has stood for over a month in airport parking and worked fine afterwards. But the other day it wanted to run engine maintenance mode, described on Wikipedia as
"For users who drive mostly in electric mode, and to avoid maintenance problems caused by storing the same gasoline in the tank for months, [it] has a sealed and pressurized fuel tank to avoid evaporation...Also, the engine management system monitors the time since the engine last ran, and prompts the driver to run past the 40-mile (64 km) all-electric range before recharging to consume some gasoline. If the driver does not run on gasoline, the system automatically runs the maintenance mode, which starts the engine to consume some of the aging fuel and circulate fluids within the engine" due to not having been run on petrol for quite some time."
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