RENPHO Bluetooth Body Fat Smart Scale

Ok I’ve had this thing 7 months. During that time I’ve gonna through a body recomp as well. Lost 15 lbs and went from 21% bf to 15%. For the most part the scale is decent (connects to phone easy and works). It’s not accurate though. When I got under 17% BF I noticed it giving me weird readings. As I progressed lower and lower readings have gotten more out of wack. My muscle mass sometimes changes drastically both up and down in 24hrs. BF % seems to move a lot too when I’m on a set diet and schedule like I am it shouldn’t and it can be pretty discouraging to see those #s change so much when they shouldn’t be. I should mention I’m on a creatinine regiment and it’s possible that is what’s throwing numbers. Also the “athlete” mode gave me numbers which were objectively wrong so no help there. At this point scale is actually asking me if I have the right profile on because of drastic weight and metric changes once a week. It’s great at first. Helps get you motivated and cognizant of eating decisions. But just not accurate at all for other metrics than weight as you progress. Also I’ve changed the batteries 3 time in 6months, this seems excessive