I recently, actually today, purchased an Efest LUC charger. This charger is fairly new compared to the Nitecore I4 and I2 model. It's a 2 bay charger that can charge pretty much every size vaping batteries out there. From 18350 to 18650's, this baby can charge them with ease. Both bays are independent, which means that if you charge 2 batteries that have different amount of voltages in them ( 1 battery is half full and the second battery is almost empty) one bay will charge the battery to it's full amount and will stop charging and will trickle charge that battery while the second battery will continue to charge until it reaches it's full battery capacity and will also kick into trickle charge. The selling point of this charger is that it has a numeric LCD display indicating the capacity of the battery, compared to other chargers out there which uses led lights going from red color to green color. I prefer a numeric display cause you can actually see the progress of the charge and determine how long the battery will take to fully charge. Once the batteries are fully charged, the numeric value on the display will read 4.2v and the 3 charging indicators on top of this numeric display will stop flashing. I think in time, this charger will be the go to chargers for all vapers out there because of this numeric LCD display. The cost of this charger is anywhere from $30-$35. I bought mine from a local vape store in Alhambra (5 miles away from Los Angeles). I know I've used this charger for only 1 day or so, but from the looks of the way this charger works, it's appearance, and fully charging my 18350's and also my 18650's in less than 2.5 hours, I would highly recommend it. I've also Googled the reviews for this charger and everyone who has reviewed this charger has been very pleased with their purchase. Anyway, good luck on finding the right charger for you.