Review on OP/TECH USA Battery Holster: Compact SLR Battery and AA Batteries Case by Vanesa Williams

Well sized case that holds the battery securely in place. My EN-EL23 battery (for Nikon P610) fits in perfectly. Unfortunately, that's all good I can say about this holster. It is not fully closed, which can cause problems in a humid environment. Worse, it's ONLY for use on camera straps, and even those are difficult to put on. The flap should go under the elastic and the strap should also go through the elastic. If not, you could clip it to your belt, but that's impossible. I found an alternative, although it's not perfect either. I carry the battery(s) in a plastic box in a holster for increased moisture resistance. In this case, however, this was not possible due to the narrower fit.