Actually not a bad price. I don't think one would have to go to the $37.95 10,000mAh unit. 6,700mAh should give you at least 3 hours of UPS.
But unfortunately with my new EasyAcc 10,000mAh, I discovered this afternoon after running it as an UPS (with no external AC) for 4 hours without problem, it could not operate the Dreamcatcher and recharge simultaneously when I plugged the EasyAcc back into AC.
I'll have to regroup - - that is recharge the EasyAcc, then try to operate in an UPS mode for 1 hour to see if it does the job. Ken