THEsmart , I can offer a non-standard solution to the problem (I read about yoho sport on the Internet, I just don’t remember which problem was fixed by this method). The bottom line is that as the manufacturer assures, for the best functioning of the device you need to charge and discharge it for about 3 cycles. Someone from the owners of yoho sport discharged it by the fact that he left his gadget in the refrigerator for I do not remember for some time, and after charging it turned on and everything worked: D. If your gadget is inexpensive, then go ahead, but just unsubscribe here how the experiment went: thank_you: