Lithium batteries supplied and fitted

I am looking to purchase lithium batteries for a specific application and have a medium budget available. As well as the battery itself, I require delivery and installation of the battery to its intended location. I am not sure of the specific requirements of my application and need advice in order to find the most suitable battery for me. I am looking for a freelancer who is able to provide advice on the most suitable battery based on my specific needs, and if possible, provide delivery and installation of this battery to the intended location.