Wireless keyboard eats batteries

I have a MBP running OSX 10.7.5, and my apple wireless keyboard has suddenly (as of a couple of weeks ago) started eating batteries. 5-8 hours, I will go from 100% to 12%. Prior to this, over the last year and a half, its been fine, I would maybe change batteries about once a month, if that.
I am not using a magic mouse with it, its a wired mouse.
I tried flashing the PRAM once.
Can anyone help?

Hello:
Offhand, it sounds like something went wrong with the device.  There is no setting (that I am aware of) that would affect battery usage.
Barry

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