TheArduino Nano can be powered via the Mini-B USB connection, 6-20V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). The power source is automatically selected to the highest voltage source. The FTDI FT232RL chip on the Nano is only powered if the board is being powered over USB. 12voltis the "basic" rating. like you buy a 12volt lightbulb for the headlights, but in reality it will get about 14.2 when a propper alternator is used. the battery is also a "12volt battery", but -resting- voltage of a healthy one is about 12.6, and below 12.4 is a sign of it starting to be less happy. GuanTingUniversal AC Adapter 12V 2A Power Supply Charger 24W AC110V to DC12V 2000mA 1500mA 1000mA 500mA Power Driver 8 DC Plug Tips 12 Volt Converter Inverter Transformer ac dc Adapter(DC12V~2A) to 12V Car Cigarette Lighter Socket AC/DC Power Adapter Power Supply for Car Vacuum Cleaner Car Fan Car MP3 Other Car Devices Under 60W. 4.3 out Heres a photo of the official Black and Decker replacement charger, you can see it outputs 15.3V . Black and Decker EPC12 PSU. The 12V battery of the EPC12 actually needs from 14V to 16V to adequately charge. Anything less, like 12V, and the battery won't charge. Here's the replacement PSU for the EPC12 on the myVolts website - we find .

can you use a 12v adapter for a 14v device