Round cell charger index
This list gives the sizes for lots of popular chargers. The VP4 plus dragon says the length is 30-72 so it should fit the 21700 no problem.
That's why I bought it. The VP4 Dragon will handle 21700's with room to spare.
I had other chargers where I could make them fit, but it was obviously stressing the charger, the springs were beyond intended capacity. No problems with the VP4 Plus Dragon.
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