Welcome to the store! Feature: The ideal solution for many cameras such as Olympus OM1, Rollei 35, Yashica 124G, etc. that used the original PX625 (1.35V) battery. (But does not fit Leica M5) Today's equivalent of the PX625 battery is \"PX625U\". It has the same size and shape, but the voltage is 1.55v - which means the battery will give an \"overvoltage\" and would give incorrect meter readings. One of the solutions is to buy a Weincell PX625 battery, which at around 6.99 can make it a bit expensive to use your camera (as zinc-air batteries only last a few months after being activated) So is there any other solution? Yes - insert this adapter (which has the same shape as the PX625 battery) into the battery compartment of your camera and power it with a \"Zinc-Air 1.4v battery\" - the good news is that the 1.4v Zinc-Air battery (which has the shape of a standard LR44 battery) can be purchased for around 50p - so it's a big saving if you use your cameras often. The Zinc-Air battery is known as 675 battery (also known as: hearing aid batteries) The adapter is precision made Note: the ad is for the adapter only - \"1.4v zinc-air batteries\" can be found online from a number of sources (The picture shows the original PX625 battery against the adapter and Yashica 124G - which are both not included) Q: Will this convert the voltage of a battery? A: No - the adapter will not convert a voltage - it only converts the physical size of the battery Q: Is there an adapter that converts voltage? A: Yes, there is an adapter made with a small microchip - but they are not that reliable - they work well at first, but after a few uses they start to give intermittent problems with the voltage. Our adapter has no chip, so it is much more reliable - and still gives the correct reading (when using zinc-air battery). Q: So what battery do I need? A: You need a Zinc-Air 1.4v battery - which is known as a 675 (often called a hearing aid battery). They cost around 50p Name: Battery Converter Adapter Packing list: 1 * Battery Converter Adapter (Battery not included) Your satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will give you the best solution!