Kastar 4-Pack DLi109 Battery and LTD2 USB Charger Replacement for Pentax D-Li109 Battery, D-BC109 Charger, K-R KR, K-30 K30, K-50 K50, K-70 K70, K-500 K500, K-S1 KS1, K-S2 KS2, KP, KF DSLR Camera

These batteries are cheap, but quality control is poor. I can use them in my Pentax K30 which can take an optional AA battery pack or a rechargeable lithium battery. They are a bit too thick so they fail to eject when you try to remove them. You have to pry it out with some kind of tool, which is unacceptable. My K70 takes a lithium battery, so there is no extra space to use something to pry it out, so I won't use them at all for the K70. I may try to sand down the shell to reduce thickness. Disappointing. The Pentax battery costs too much, but the Polaroid fits and functions fine, at a much lower price. I may buy more Polaroids. You really need extra batteries with these cameras, especially if you are using autofocus lenses and the live view screen a lot.