Multivoltz located at yourmultivoltz.com, which claims to be a supercharger that can quick charge any USB device on the spot and heals the battery, is untrustworthy and appears to be a scam. The Quick Charge(QC) technology, invented by Qualcomm, which Multivoltz claims to use, is not compatible with all devices and it does not repair or heal the battery. But, Multivoltz claims it is possible.
Multivoltz at Yourmultivoltz.com

Qualcom said to ensure you are getting the most optimized charging experience possible, you should make sure your device and charger are both Quick Charge compatible. You can check here to verify if your device is a Qualcomm Certified quick charger.