Specifications

Section 18. Care and Maintenance
18-2
18.4 Replacing the Internal Battery
Misuse of the lithium battery or installing it improperly can
cause severe injury. Fire, explosion, and severe burn
hazard! Do not recharge, disassemble, heat above 100°C
(212°F), solder directly to the cell, incinerate, nor expose
contents to water. Dispose of spent lithium batteries
properly.
The CR1000 contains a lithium battery that operates the clock and SRAM
when the CR1000 is not powered. The CR1000 does not draw power from the
lithium battery while it is powered by a 12 VDC supply. In a CR1000 stored at
room temperature, the lithium battery should last approximately 10 years (less
at temperature extremes). Where the CR1000 is powered most or all of the
time the lithium cell should last much longer.
While powered from an external source, the CR1000 measures the voltage of
the lithium battery daily. This voltage is displayed in the status table
(Appendix A). A new battery will have approximately 3.6 volts. The CR1000
Status Table has a “Lithium Battery” field. This field shows lithium battery
voltage. Replace the battery when voltage is approximately 2.7 V. If the
lithium cell is removed or allowed to discharge below the safe level, the
CR1000 will still operate correctly while powered. Without the lithium
battery, the clock will reset and data will be lost when power is removed.
A replacement lithium battery can be purchased from Campbell (part number
13519). TABLE 18.4-1 lists the specifications of the battery.
TABLE 18
.4-1. CR1000 Lithium Battery Specifications
Manufacturer Tadiran
Model TL-59025 (3.6 V)
Capacity 1.2 Ah
Self-discharge rate 1%/year @ 20°C
Operating temperature range -55°C to 85°C
The CR1000 must be partially disassembled to replace the lithium cell.
FIGURE 18.4-1 through FIGURE 18.4-5 illustrate how to disassemble the
CR1000. Re
verse these steps to reassemble the CR1000.
CAUTION