Industrial Data Systems IDS 160 - Manual (Page 9)

2.3 THE BATTERY BACKUP FEATURES.
The battery is used for the following functions :
1. TIME AND DATE CLOCK
. The battery keeps the clock running when power
is turned off.
2. TICKET NUMBERING
. Automatically prints a ticket number on each
transaction. The battery keeps the number in memory when power is
turned off.
3. TOTALS
. The battery permits storage of the subtotal and total in
memory when power is turned off.
Configure the BATTERY BACKUP option to ON if any of the battery backup
functions are used.