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The Elephone P9 Water and the Vifocal W92 are based around the same OEM chassis. The batteries are compatible to each other. Right now I'm using a Vifocal W92 battery in my Elephone P9 Water:







So why use a Vifocal W92 battery in a Elephone P9 Water? At least on the paper the battery has a greater capacity:

• Elephone P9 Water: 2100 mAh / 7,77 Wh
  
• Vifocal W92: 2700 mAh / 10,26 Wh
  

Screen protectors from the Vifocal W92 do also fit as you can see on the above pictures. The following accessories should be compatible:

• back cover
  
• flip Cover
  

I will test that after receiving them and update this post.

Do you have a link where I could buy one of those batteries?

Hi Horst, my battery from W92 does not work in elephone p9 !!! How did you do it ??? You owe me 15 $ !!!!!!!!!!!!!