[Q] Battery for Chinese android topic

I bought a Chinese phone when they weren't as popular as they are today and cant find anyone that stocks the battery i now need since the old one had died. The phone was sold as a Goophone S4 MAX but I believe it also sells as a Star W9208, Elephone P6, Elephone P6S. The battery I need is http://www.zbozizdovozu.cz/Elephone-...erie-d1075.htm

Does anyone know where I can get a battery for this phone? If not, anyone know how I could possible turn an android smart phone on without a battery, or with mains power or an alternative battery?

Thanks