My B&M stopped selling ego-c upgrade batteries and so I purchased an EVOD 650mah battery from them. I've been charging it on an ego charger (the one that came with my starter kit 9 months ago). The light on the charger does not turn to green like it does when I am charging one of my ego-c batteries, any ideas on how long I should leave my EVOD battery on that charger to have a full charge?