Rock rider est900

[Newbiker]

Good evening everyone I've join3d the mtb world recently as I bought myself a rockrider est 900 and some lowlife his stolen my battery as they couldn't steal the whole bike......I'm hoping I can find one within the community as I can't afford the £400 decathlon are wanting for a new one.
Hope someone can help

 

[Trip Hazard]

What a sickener. Hope you get sorted.