HOBO U12 4-External Channel Outdoor/Industrial Data Logger
7
The Battery
The logger requires one 3-Volt CR-2032 lithium battery. Expected battery life varies based on the temperature and the
frequency at which the logger is recording data (the logging interval). A new battery will typically last one year with
logging intervals greater than one minute. Deployments in extremely cold or hot temperatures or logging intervals faster
than one minute may significantly reduce battery life. Onset recommends that you install a fresh battery before every
deployment if temperatures below 0°C (32°F) are expected.
To replace the battery:
1. Disconnect the logger from the computer.
2. Use the Allen wrench to remove the four socket head screws on the logger’s cover. Then remove the cover.
3. Carefully insert a thin screwdriver blade between the edge of the battery and the battery contact that is farther from the
red LED. Gently pry up the edge of the battery, popping it out of the holder.
4. Slide the new battery, positive side up, under the two small tabs of the contact that is closer to the red LED. Press down
on the battery until it snaps into place. The logger’s LED will blink several times.
5. When the new battery is secure, close the logger’s case as described in the “Closing the logger” section of this manual.
WARNING: Do not cut open, incinerate, heat above 85°C (185°F), or recharge the lithium battery. The battery may
explode if the logger is exposed to extreme heat or conditions that could damage or destroy the battery case. Do not dispose
of the logger or battery in fire. Do not expose the contents of the battery to water. Dispose of the battery according to local
regulations for lithium batteries.
©
2009 Onset Computer Corporation. All rights reserved.
Onset and HOBO are registered trademarks of Onset Computer Corporation. Other products and brand names may be trademarks or
registered trademarks of their respective owners.
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