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Battery capacity reduces in line with increased use. If the capacity of the
two fully-charged rechargeable batteries clearly falls below 24 operating
hours, then you need to replace them.
Always insert two fully-charged rechargeable batteries or two new
batteries, before taking a new measurement.
4.5 Inserting batteries
The battery compartment is located on the underside of the recorder.
In order to open this compartment, use your thumb to move the battery
compartment lid approx. 6 mm backwards and then remove the lid in an
upward direction:
Please ensure that the batteries are inserted correctly!