This information pertains to LabQuest 2.

If you have a LabQuest 3, see this article.
If you have an original LabQuest, see this article.

To verify that a LabQuest 2 is charging, connect the unit to AC power, turn the unit on and look at the icon in the lower right. A correctly charging battery will display this icon: 2763-battery-charging-040.png

If you are seeing a red icon in the lower right corner of the LabQuest 2 screen then for some reason the LabQuest is not charging: 2763-battery-error.png

The LabQuest 2 battery ships with a small spacer over the contacts to protect it from accidental contact. Verify that this spacer has been removed. 2692-battery.jpg

If you still see the red icon after you’ve removed the spacer, remove the battery from the back of the LabQuest 2 and verify that nothing covering the contacts on the battery or LabQuest 2. Reinstall the battery.

Note that it may take up to a minute for the icon to update after doing the above steps.

If the battery is still not charging, see:
LabQuest 2 Battery Troubleshooting and FAQs
What does the battery icon on my LabQuest 2 mean?