Hi. My Joye ego was going strong for a couple of weeks, now is having problems. It lasts around 10 mins. When I put it on the 510 charger it stays red, even if I have left it there all night. It used to take about 6 hrs or so to charge. When I take it off the charger it is only working for around 10 mins. This is exactly the same when charging on the USB fast charger. My 510 charger seems to charge all other batts fine. Any way of fixing this? Or is it stuffed? Thanks