2
Managing the A-1519/A-1520 Battery Capacity
The Radio Transceiver Module built into the targets draws a significant amount of power from the
internal battery, particularly when it is transmitting data. To conserve the battery, it is important that the
Data Polling Rate (the number of data requests per second) is as infrequent as possible.
The following plot shows the battery discharge rate of an A-1519-900 Target (A-1519 with 900 MHz
radio transceiver). With a Data Polling Rate of two samples per second, the target can be used for at least
10 hours. Increasing the Data Polling Rate to the fastest rate of three samples per second reduces battery
life by approximately 10 percent.
Note:
The shelf life of lithium polymer batteries is 2-3 years under optimal conditions. Expect the battery
capacity to drop to 80 percent after 500 charge/discharge cycles. To extend battery life, keep it away
from heat (for example, inside a closed vehicle in full sun) and for best results,
charge the battery to 100 percent of capacity and then allow it to discharge to 20
percent of capacity before recharging. Hamar Laser recommends replacing the
internal battery every 10-12 months if the target is used daily for at least eight
hours.
Resetting the Target
A target may be reset if it “freezes up” (LEDs don’t blink and the target does not
shut down even when the laser is not powered on) by inserting the tip of a bent
paper clip into the small hole shown in Figure 2.
Figure 2 –
Reset hole for target
