WTB: Pentax D-BG5 Battery Grip for Pentax K-3/K-3 II camera bodies

Looking for a genuine Pentax D-BG5 battery grip to replace my faulty after-market DSTE grip.

I've found that my DSTE grip is reporting incorrect battery data to my K-3II body. With a battery in the grip, I only get a few minutes of Live View before the battery appears to be partially depleted. I ran a battery down to one bar in the grip, then transferred it to the body where it again appeared to be fully charged, hence my conclusion that my DSTE grip is faulty.