8.4 Internal battery
The lithium battery powers the internal clock and SRAM when the data logger is not powered.
This voltage is displayed in the LithiumBattery (see Information tables and settings (advanced) (p.
163)) field in the Status table. Replace the battery when voltage is approximately 2.7 VDC. The
internal lithium battery life is extended when the data logger is installed with an external power
source. If the data logger is used in a high-temperature application, the battery life is shortened.
To prevent clock and memory issues, it is recommended you proactively replace the battery every
2-3 years, or more frequently when operating continuously in high temperatures.
NOTE:
The battery is replaced during regular factory recalibration, which is recommended every 3
years. For more information, see Data logger calibration (p. 109).
When the lithium battery is removed (or is depleted and primary power to the data logger is
removed), the CRBasic program and most settings are maintained, but the following are lost:
l Run-now and run-on power-up settings.
l Routing and communication logs (relearned without user intervention).
l Time. Clock will need resetting when the battery is replaced.
l Final-memory data tables.
A replacement lithium battery can be purchased from Campbell Scientific or another supplier.
l AA, 2.4 Ah, 3.6 VDC (Tadiran TL 5903/S) for battery-backed SRAM and clock. 3-year life
with no external power source.
See Power requirements (p. 211) for more information.
WARNING:
Misuse or improper installation of the internal lithium battery can cause severe injury. Fire,
explosion, and severe burns can result. Do not recharge, disassemble, heat above 100 °C (212
°F), solder directly to the cell, incinerate, or expose contents to water. Dispose of spent
lithium batteries properly.
NOTE:
The Status field Battery value and the destination variable from the Battery() instruction
(often called batt_volt) in the Public table reference the external battery voltage.
8. CR6 maintenance 116
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