Lithium-ion type batteries are more rugged and efficient than lead-acid batteries. They allow more charging flexibility than lead-acid batteries, with 70% space and weight savings. They also benefit from a wide operating temperature range, excellent cycling performance and low internal resistance.
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'.
Victron Energy offer a manufacturer warranty of 2 years on their products.