A major feature that I have to have in a charger, is the ability to manually select the amp charging rate. I prefer to charge my 18650s at 0.5amps. I'm very uncomfortable with the newer chargers with a minimum of 1.0 amps for that battery....altho you can certainly charge one at that rate, I just prefer a slower charge, less heat. I am seeing new chargers with 2 amp rates on larger batteries....like the trend in cell phones, faster isn't always better.