Symbol Series 3800 Reference Manual page 88

Series 3800 Product Reference Guide
Figure 6-5. Installing the Alkaline Battery Adapter
4. Put the end cap on and twist the D-ring halfway clockwise to lock it.
5. Press the D-ring flat to secure it.
Note: The Series 3800 terminals have a built-in safeguard to ensure that
alkaline batteries are not recharged when placed in a cradle or
connected to the PC Adapter.
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