I have a Hobbico Quick Field Charger Mark II that I use to charge all my batteries. I'm charging a Ni-Cad 1.2 volt 2800 Mah. Verything goes ok for several hours then I get the beepping and the alternating green and red light. I understand what the lights mean but why does everything go ok for several hours first. I've had this happen to other batteries only to reset and verything work ok to the battery receives its full charge and the light just flashes indicating that it's in the trickle charge mode. Thanks for the help.

chopper