#2 Will it charge my car battery when I go outside and find i left the lights on for two days and car won't start?
Yes. NEXPEAK NC101 battery charger support trickle charge which can keep your batteries fully charged for months.
1. Choosing corresponding modes(STD/AGM,GEL/WET/MOTORCYCLE) to fully charge the battery, screen display "FUL"
2. Then switch to "MOTORCYCLE" mode will auto-enter trickle charging mode to keep batteries stay charged for a long time.