Maintenance
306 FTB-2/FTB-2 Pro and FTB-4 Pro
Replacing Batteries
2. Use the markings on the back panel to locate the battery that you want
to replace, and then pull on the battery’s tab to free it from its socket.
IMPORTANT
On the FTB-2 units, the second battery slot does not power the unit.
The battery must be inserted in the first battery slot (as indicated
on the label affixed to your unit).
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