Insta Charger

I wasn’t sure where to post this, CS or here under electronics> I tried writing a review on a purchase I made back in July of this year, 2015. But I went to submitt, and got the message, I alread wrote a review. I didn’t, I tried to find it. Too many to sift through. My issue is, one of the identical batteries rattles inside the case. I purchased the 2 that was on special, I believe it was a holiday, or birthday price?  they still have them, just at a higher price and no fex-pay. I had ordered the black/black. I have been using them, they both work. Don’t use them as often as most people probably. They are nice to have in an emergency. I primarily use them for my smart phone, heven’t tried them with my tablet yet. They are both suppose to be 3200mAh am I not correct? My thought is the one that I shake and can hear it moving inside the encasement, is a smaller mAh? I don’t really want to return them  for a refund or otherwise, besides it’s probably too late. I just wanted to bring that to your attention, and see if anyone else seems to have experienced this. Just odd that’s all