Just visited Bimble and the guys there explained and sorted my ancient motorhome's solar arrangement and saved me money in the process - they could have taken much more off me but didn't, and that's priceless! Highly recommended.
Please Note: The Varta LED range are a sealed maintenance free battery. However they are a flooded (wet) lead acid battery and like other sealed batteries such as AGM they have a vent valve. Therefore if the battery was accidentality tipped on its side or punctured it would leak dilute sulphuric acid out.