Checking the battery charge levels and LED status
The TSC510 controller is powered by internal battery which are not removable, and an optional, user-replaceable accessory battery pack which enables you to double the battery run-time.
If you are using the optional user-replaceable accessory battery pack, you can charge it while installed in the device, or externally.
LED charging status
An LED on the keyboard (above the Power key) shows the charging status. The charging LED applies to the internal non-removable battery and the optional user-removable battery pack.
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☀ Green: fully charged.
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☀ Amber: charging normally.
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☀ Red: battery charging error. It can take the device approximately 30 seconds to recognize a bad battery and indicate a charging error.