Probably the alternator, assuming the battery and all the connections are OK. That light indicates a problem in the charging system, not necessarily limited to the battery.
The car was in storage for winter and I had forgotten to remove the battery so when I to it out of hibernation I put a new battery in so over winter the alternator would be shot . That's sucks !!!
A forum community dedicated to all Smart Car owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, economy, maintenance, and more!