Product Manual

20
1. Remove the power connector from the charger, and reconnect it to start the charger.
2. If the transmitter is warm, move it to a conditioned space, and allow it to cool for several
hours before attempting to charge again.
3. If the error message remains on after the steps above, contact Schonstedt Instrument
Company for further instructions. Also, please refer to the Battery Replacement portion of
this manual.
Recommendations for Battery Charging and Storage
Due to the composition of the battery and the safety features built into the charger, it may be
necessary to complete two or more full-charging cycles in order to bring the battery back to
full capacity after it has been completely discharged. If you suspect the battery has been fully
depleted, such as when it has been in storage for a long time or when the transmitter won’t
turn on, it is recommended to do at least two consecutive charging cycles before resuming
normal use of the battery. Make sure you unplug the charger from the battery in between the
two cycles.
Before normal charging can begin, the battery pack temperature and voltage must fall within
predetermined acceptable limits. The temperature must be between 50° and 104° F (10° and
40° C). When the charger detects that these two conditions are not met, it will continue to
“trickle charge” until the two conditions are met. Then, it will start normal charging.
If the battery is faulty and never reaches an acceptable voltage to start normal charging,
the charger continues to trickle charge. In this case, only a small fraction of full charge will be
reached after the normal 4-hours of charging time.
If the charger is charging the battery in normal charge mode and the temperature rises above
140° F (60° C) before the battery is fully charged, the charger will switch to trickle charge mode.
In this case, full charge may not be achieved after the normal 4-hours of charging time. The
battery pack also contains a thermostat that will open the circuit for safety if it gets too hot.
The higher the storage temperature, the faster the battery will self-discharge, reducing its
shelf life. The recommended storage temperature is 50° to 70°F (10° to 20°C). Storing the
battery at higher temperature can reduce its overall life; storing it t colder temperatures is
preferred and beneficial.
Battery Replacement
The rechargeable NiMH battery pack that powers the transmitter should provide a very large
number of charge-discharge cycles. However, like all rechargeable batteries, it has a finite life
and eventually may have to be replaced if it can’t hold or can’t reach a full charge. In addition, if
the transmitter is malfunctioning due to a defective battery, the user can replace the battery in
the transmitter with a new one received from Schonstedt.