What is the top of the line 18650 battery charger out there right now? I'm getting a little tired of not having any readouts, save for a red, or green light. To indicate charged, or still charging. And the batteries take about 5-7 hours to charge. What's up with that? Isn't there a charger out there that will charge the 18650 in a shorter time? Which is the very best battery charger out there?