dang

At some point over the winter the gfci I have this plugged in to tripped and the charger stopped charging allowing the batteries to die. I just reset the gfci (outlet is definitely working) but the light on the charger isn't going on, neither is the light by the charge port on the mower. Has the charger somehow failed by not having power? It was working fine 3 months ago, I have no idea when the gfci tripped, but long enough ago for the batteries to completely drain. Is there some way to reset the charger? I've had it less than a year, if the charger is the problem (it's possible the charger is what caused the gfci to trip, although I don't know why it would after it being used fine for 6 months) will it be replaced under warranty? Thanks for any help you can offer