See also Physical specifications (p. 163).
8.4 Internal battery
The lithium battery powers the internal clock and SRAM when the datalogger is not powered.
This voltage is displayed in the LithiumBattery (see ) field in the Status table. Replace the battery
when voltage is approximately 2.7 Vdc. The internal lithium battery has a three-year life when no
external power source is applied. Its life is extended when the datalogger is installed with an
external power source. If the datalogger 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 Datalogger calibration (p. 99).
When the lithium battery is removed (or is depleted and primary power to the datalogger 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. 163) for more information.
8. Maintaining your datalogger 105
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