Battery you need – https://amzn.to/2HuHM6n
Here is a little video on How to replace or change Peugeot 207 307 key fob battery. This also works on a 308 or 407.
Peugeot Replacement 2 Button Remote Car Key Fob Case with HU83 Flip Blade for 107 207 208 307 308 407 408 607 807 3008 5008 Expert Keys and Fobs for Peugeot Cars and Vans
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Battery you need – https://amzn.to/2HuHM6n
Nice video, man!!