It can be safe, but is not recommended. If your battery light comes on in your car, you should turn off your accessories to keep the battery from completely draining. Whenever this light comes on, it can mean something is wrong with the alternator and that you’re operating only on battery power. The alternator's job is to keep your Acura's battery charged while you're on the road. If the alternator isn't operating correctly, the battery may completely discharge, leaving you stranded if the engine is switched off.