If you can't get it into READY mode (green car w/arrows), it's probably a low 12 volt battery, that can be remedied by jump starting. If it continues, esp. after you charge the 12 volt w/a real 12 volt charger, the 12 volt battery might be bad.
Measure the 12 volt voltage with a multi-meter/volt meter after the car has sat for many hours (before turning on the car). I suspect it's low.
'13 blue Leaf SV w/premium package (owned)
'13 blue Leaf SV w/QC + LED & premium packages (lease over, car returned)