My wife and I have the same model of phone Sanyo
spray the battery compartment down with silicon spray (Napa auto parts) then quickly wipe,,,,,spray(drench) the battery charging inlet,,,then tooth brush it,,,,attach the battery to phone,,,but this time place a papertowel spacer between battery and battery door,,,,secure cover,,,then attach charger cord to silicon drenched inlet,,,,,wait till charging is completed,,,,,then you are finished!!!