I got 6 months using 2xAA. If your board has a 5v regulator, either get another board ( pref without one), or make sure it is a low quiescent current type. Rip

I got 6 months using 2xAA. If your board has a 5v regulator, either get another board ( pref without one), or make sure it is a low quiescent current type. Rip out the LEDs. Use deep sleep.