Internal battery

The lithium battery powers the internal clock when the data logger is not powered. 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 5 years, or more frequently when operating continuously in high temperatures. For example, replace at least every 2 years if operating continuously at 80 °C.

NOTE:

The battery is replaced during regular factory recalibration, which is recommended every 3 years. For more information, see Data logger calibration.

When the lithium battery is removed (or is depleted and primary power to the data logger is removed), the ClosedCRBasic Campbell Scientific's BASIC-like programming language that supports analog and digital measurements, data processing and analysis routines, hardware control, and many communications protocols. program and most settings are maintained, but the following are lost:

  • Temporary program memory (current values for variables).
  • Routing and communications logs (relearned without user intervention).
  • Time. Clock will need resetting when the battery is replaced.

A replacement lithium battery can be purchased from Campbell Scientific or another supplier.

  • 3 V coin cell CR2025 for battery-backed clock. 6-year life with no external power source.

See Power requirements 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.

For additional information on the internal battery, visit the Campbell Scientific blog article, Get to Know Your Data Logger’s Spare Tire: The Lithium Battery .

Replacing the internal battery

It is recommended that you send the data logger in for scheduled calibration, which includes internal battery replacement. See Data logger calibration.

WARNING:

Any damage made to the data logger during user replacement of the internal battery is not covered under warranty.

  1. Loosen or remove the screws from the sides of the data logger.

  2. Pull the bottom and top of the data logger apart.

  3. Carefully pinch each of the four plastic pins and pull the top circuit board away from the mounts and connector. A wire connects the board, do not pull the board too far and damage the wire connection.

  4. Remove the lithium battery by gently prying it out with a small flat-bladed screwdriver.

  5. Install new battery.

  6. Reassemble the data logger. Take particular care to ensure the board is reseated tightly onto the plastic pins and connector.