Months. Easily. My K-30 uses the same battery. It's my back-up camera, and I've just had to send my main in for service. My last photo-set from the K-30 is dated from January. That's probably the last time I charged the batteries. I have one aftermarket, and the original Pentax. The aftermarket was in the camera, and after a week's use was ready to recharge. Had to fumble around various camera bags to find the Pentax original. Put it in, and it's full up and ready to go. Honestly, I'm kinda amazed.
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