Um, yes. If the backup (secondary, rechargeable, but only about 50mAh max., if you are lucky) is depleted, it will not begin to recharge before the system battery in the right-hand bay has reached nearly full voltage (say 9.5V and up), so you have to offer a carrot for the backup to get off its nether regions. After a year of disuse, 48hr and more could be needed to get the backup battery excited by the thought of new life.

de