Which battery adapter work best on a Canon Model 7S?

I just got a PX625 battery which is basically a battery with a metal hoop round it and it doesn’t work on my new 7s. I’ve tested the battery 1.3v with a multimeter.

I’ve flipped it one way and the other but I cannot get a contact to happen. It’s got some little raised contact on the other side of it.

Have I got the wrong battery?

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Here is a german website with the instruction for a simple DIY adapter with diode for the voltage conversion from 1.55 V silver to 1.35 V mercury level.

 
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