Absorbed Glass Mat (AGM) batteries are maintenance free, but can supply high currents. They are ideal where you need to run an inverter, or power other hungry equipment such as a bow thruster or compressor.
If you are unsure about which battery you need for your application, have a good read of our article on the subject - 'How to choose batteries for off-grid systems'.
Rolls and Victron offer a manufacturer warranty of 2 years on their products and R12 range. The Rolls S5 and S12 range have a 5 year product warranty.