44
CAPACITY OF BATTERY PACK
=
1620 mAh
Capacity is 1800 mAh. However, power is shut down automatically before the battery power is
used up completely. For this reason, 90% of the capacity is assumed as effective capacity.
BATTERY LIFE CALCULATION
(TYPICAL OPERATIONAL PATTERN)
Q. Calculate battery life when the terminal is operated with the typical operational pattern given in
the following time chart. (This pattern simulates a routine to scan a barcode and transfer the
read data to the host.)
20.0 sec
This operational pattern is repeated seamlessly.
Laser
Scanning
30 mA
Wireless
LAN
(TX/RX)
440 mA
Wireless
LAN
(RX)
280 mA
0.5 sec amounts
to 1 KB transfer to
MORS.
Wireless LAN (TX/TX) incurs 1.0 sec of
Wireless LAN (RX) automatically as noted
in the “ADDITIONAL CURRENT
CONSUMPTION” table.
Idle
No device is driven
additionally.
17.5 sec
1.0 sec
0.5 sec
1.0 sec
A. Battery life can be calculated as follows. Bear in mind that the calculated battery life is not
always guaranteed, but it is estimation only.
Capacity of Battery Pack
= 1620 (mAh, milliampere hour)
Basic Current Consumption
= 100 (mA)
Additional Current Consumption = (30x1.0 + 440x0.5 + 280x1.0) / 20.0 (Average)
= 26.5 (mA)
Battery Life
= 1620 / (100 + 26.5)
= 12.8 (hours)
NOTE: Within the battery life (12.8 hours), 20 seconds of operational pattern can be
repeated 2304 times (=12.8x60x60 / 20).
The above-calculated battery life is the one with the LCD backlight turned off.
If the backlight is ON, the battery life is calculated as follows:
BACKLIGHT CURRENT CONSUMPTION (AVERAGE) (mA)
BATTERY LIFE (hours)
High
100 + 26.5 + 100 = 226.5
1620 / 226.5 = 7.2
Medium
100 + 26.5 + 60 = 186.5
1620 / 186.5 = 8.7
Low
100 + 26.5 + 30 = 156.5
1620 / 156.5 = 10.4
