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This review is from: Pentax DL-I8 Battery for Optio S, S6, S4i, S5i, S5z, WPi & WP Digital Cameras - Retail Packaging (Electronics)
This is a well-constructed generic equivalent (made by PowerSmart in Japan) to the Pentax DL18 Lithium Ion battery for the Pentax Optio S camera. Depending on which vendor you choose, the generic brand may vary. One of the reviewers for this battery is correct about the illustration above; it is not the battery. The battery you will get is gray. It measures 40.5mm x 35.4mm x 6mm. The three terminals are at the edge of the battery, recessed and offset to one side. It is also interesting to note that this DL18 is equivalent to the Fujifilm NP-40 battery. The battery fits snug but not tight inside the camera, so that if you accidentally undo the spring latch, it won't fall out. Functionally, it works great and lasts just as long as the original battery.