Originally Posted by
FenderBender
A fully charged 18650 will be over 4v and then go 'down' to 3.7v after a while. Most LEDs are capable of running off of a single cell. Huey Jann LEDs are almost identical in specs to LEDengin and I have used several of them. You'll be fine with a single 18650, trust me. You'll need to resistor any Red or Amber LEDs (if you're using those), but cool colors (blue, green, white etc) will be just fine. You'll be much happier in the long run.
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