In which case, you can just keep calling a cab for a boost! :canada: :thumbup: :rockon:

A third solution (besides 1. take it to get checked, and 2. just buy a new battery) is to measure the DC voltage yourself, if you have a voltmeter handy.

More info here, for example. Measure voltage after the battery has been sitting around overnight or so; 12.4V or below points to battery not holding a charge.

Also measure voltage while car is running; it should read about 13.5V, which would indicate the alternator is putting out enough juice, which recharges the battery while you are driving around.

Good luck!