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VDL200 has a configurable battery type setting that optimizes the operation of the battery charge indicator. This setting should be set according to the battery type (alkaline or lithium) when the device is taken into use, and changed if the battery type is changed.
Always insert batteries that have a full charge and are not past their expiration date. Using partially discharged or expired batteries may cause the battery level indication and alerting to work unreliably.
For more information on battery requirements of the VDL200, see Backup batteries.