I use the HV 306's just fine with the same batteries in my Reo. They even come off the charger at 3.1 volt's respectively, and the 306's are amazing.
Using them on my Darwin @ 10w (gives me about 5.9v) nonstop, same good result..
Some juices are better at lower voltages..
If you have more than one of the HV 306's try that one..
I'm trying the 801 Fusion's for the first time. Also have used the V2's cartos and they're great.
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