User's Manual

15 | Page
Proprietary and Confidential Revised 10-11-11
Each of the 3V batteries has an operational range of 2.1 to 3.0V, with end of life near 1.85V (3.7V for
each series pair).
New Battery Installation
For installation of a battery on a new SXL1, remove battery from packaging. Ensure that the gray
neoprene gasket is in place around the oval connection port to the electronic assembly section of the
SXL1. Verify that you have two 6/32 T10 Torx security screws to affix the battery to the unit. Slide
the rear of the battery into the notches on the SXL1, rotate the front of the battery down gently into
place being careful not to damage the connection pins. Place one 6/32 screw into each hole on top
of the battery and tighten to approximately 10 inch pounds
Battery Replacement
In order to replace the battery of the SXL1 remove the zip-tie or screw securing the SXL1 to the
mounting plate. While lightly pulling up on the SXL1, use a screwdriver to gently pry the locking tabs
away from the body of the SXL1. Once the SXL1 is removed from the mounting plate remove the two
screws holding the battery to the SXL1 using a T10 Torx security screwdriver. Rotate the front
portion of the battery up and remove the battery. Inspect the gaskets and connection ports for debris
and clean if necessary. Remove the replacement battery from its packaging, ensuring that the gray
neoprene gasket is in place around the oval connection port. Verify that you have two 6/32 T10 Torx
security screws to affix the battery to the SXL1. Slide the rear of the battery into the notches in the
SXL1 and rotate the front of the battery gently down into place being careful not to damage the
connection pins. Replace the battery screws in each hole on the top of the battery and tighten to
approximately 10 inch pounds. After replacing the battery use the SXL1 setup tool to reset the
battery count; this will ensure the engineering messages reflect an accurate battery power remaining.
Battery Counter Reset
See “Info Tab” section (page 14) for directions.
Battery Voltage
The SXL1 operates over the voltage variations of the battery under load.
6Vbat = 3.8V to 6.0V at voltage of batteries
Pulse current = 500 mA at 6.0 V over temperature
The SXL1 incorporates a hardware watchdog and brown out detector that will reset the electronics of
the device if the voltage drops below the minimum operable voltage. The electronics assemblies will
resume operation following reset with no degraded performance. The SXL1 will experience no loss of
non-volatile parameters.
Battery Low Threshold
The SXL1 triggers a Low Battery State when the battery capacity reaches 12.5% useful life remaining
(calculated by the device in operation). The device also contains low voltage and brown out protection
that will restart the unit upon a power interruption event.
Power Supply / Battery Life
The SXL1 is powered by field-replaceable lithium metal batteries. The typical operational battery life
(and expected location report count) is a function of use as shown in the graph below. Extended
temperature of use (outside –20 to +60 C) or obscured view of sky resulting in more cold-start GPS
fixes can shorten battery life. The graphs below depict typical usage curves. Environmental
conditions and device placement with respect to sky visibility will impact device performance.