UniTune battery short life :-(

UniTune battery short life 🙁

Bought a unitune start of this year, dont use it too often bc I have floyd rose guitars and use basically when i string change.
Problem is I get around 15-20 mins worth of tuning time per battery replacement.  I have tried duracell, cheap batteries etc doesnt matter what brand the battery life is really bad.
Is it the unit I have?? or is this normal.
Apart from the battery life I really find the unit great and useful.

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Source: http://forum.tcelectronic.com