TC Electronic PolyTune Classic - Manual (Page 15)

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PolyTune™ remembers the last used settings, even if the power has been disconnected or the
battery has been removed.
Changing battery - Unscrew the thumb-screw on the back of the pedal and detach the backplate.
Unmount the old battery and attach the new battery to the battery clip making sure the polarity is
correct. Then remount the backplate. To save battery life; remove the input jack when you don’t play.
Batteries must never be heated, taken apart or thrown into fire or water. Only rechargeable
batteries can be recharged. Remove the battery when the pedal is unused for a longer period of
time. Dispose batteries according to local laws and regulations.
Low battery indication - When the battery runs low on power the display occasionally indicates this by
writing “BATT”.