Got the Hammerhead True wireless earbuds for Christmas (via Amazon). They were charged until green light came on but the power went down straight away. I charged them overnight so tried again on Boxing Day. This time they lasted 45 minutes before low power warning. Downloaded the Razer app and it showed (after charging again) that the earbuds were at 100% charge. Tried to use again but battery was down to 90% after just taking them out of the case! Do I have a faulty pair or is there something I need to do in settings?