Lithium-based battery systems are by far the most powerful energy carriers currently available. On one hand they are characterised by a high specific energy density, which means they are able to store a large amount of energy per kilogram of battery weight.
In addition, lithium batteries can withstand high current, in other words they are able to deliver their capacity even under high loads. Both these characteristics are of great importance for applications in boat drives, battery weight and volume on board is reduced and the lithium-based battery systems ensure that the power supply does not collapse even when the boat's electro-motors temporarliy draw high currents from the batteries.
Even when sotred for many months, almost no charge is lost.