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I want to wall mount my collection (small but increasing) of Mountfield Stiga batteries which look like these... onto something like these, or functionally similar... Anyone done anything similar, and can recommend a specific Mountfield Stiga compatible product? Alternatively, which other...

Some may know that I have a APC Smart 1500VA UPS that protects my network and rack server at my home. It is normally at a 25% load. The UPS was original manufactured in September 2007 and I bought it second hand on ebay in 2013. I have replaced the batteries twice since having it and are due to...