My H2 has a feature that turns off the back light after a preselected time, which is a battery saver. As Diki stated, it draws very little power at all, and if I recall correctly, you can record continuously up to 2 hours using fresh batteries.

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)