Powered by a 6A lithium battery of its own ... to be safe in case your battery dies unexpectedly, the GPED 12V Car Battery Smart Charger is one of the better deals you’ll find at the moment.
But, while it’s tempting to grab a cable and use the USB port, you might well find your smartphone battery charges ... than those at home. Best car charger: 12V to USB adaptors to keep your ...