Yes battery life is significantly increased.
My phone is a x10 mini, not the pro.
First time I tried to post links to pictures the interface told me that I have to post at least 8 times before beeing allowed to post external links.
Anyway, I'm not at home today and don't have the pictures with me.
Tomorrow evening I'll try again and if still not possible I'll send you the links and explanations on your PM mailbox.
Warning : this mod is hazardous as there is no more space and in case of battery failure it may lead to the destruction of the phone.
A. Disassemble the EP500 battery (same way as Gx3)