My superseal has a Beta 14, which must be similar.

When I replaced my starter battery a couple of years ago my main consideration was that the new one should fit the space the old one occupied, so armed with the dimensions I visited a car battery supplier (ATS I think).

The second requirement was sufficient grunt to turn over the diesel engine.

I purchased the right size which happened to be the battery fitted to a Mitsubishi Shogun, so I recon I got the power right too.

It has performed fine, the key is to not let it run down.

I hope this helps

Philip

rascal