Can A Sealed Battery Be Laid On Its Side. There are even brackets designed to interface with the top of the battery for side mounting. Many of the SLA batteries that I have seen actually have the charge specs printed right on the side of the battery.

The batteries are sealed so the main concern is probably cooling. The battery is an Amp-Tech and the web site states Fully Sealed AGM batteries give added safety in rough conditions. Looked for a low profile reserve battery but cant find one with terminal height less than maybe 225mm.
The sealed lead acid batteries can be used on its side.
The only damage I can think of is if a cap was loose and spilled acid on the manager. There are even brackets designed to interface with the top of the battery for side mounting. We do often see trailers with their breakaway battery installed in this way. Just make sure you charge it.
