Lock Door and can't unlock when return

I have the Trimark keypad that I have been using for 8 years and it only failed to work one time. My keypad operates off the chassis batteries and when my BIRD hung up the chassis batteries were so low the keypad wouldn't open the lock. My patio awning also runs off the chassis batteries. I jumped across the coach batteries to the chassis batteries at the rear run bay which was enough to get the keypad to unlock the door.