Hi, i know this post is from 3 years ago now, but i've had my HC shoes since 2015 and only worn them once. I have an 80's party in 2 weeks and i took my shoes out of storage and found that the battery won't hold charge. They work fine when plugged in, but not at all when in unattach the charge cable. I've charged them using my usb cable plugged into the wall via phone charger plug. If i use a 2800 mAh portable charger do you think this would be okay if i wear them out plugged into one?