The energy for the electric boat engine comes either from batteries/rechargeable batteries. The type, size, circuitry, and capacity of the battery is critical to how efficiently and for how long the electric motor is powered. Different types of batteries such as AGM, gel, lithium or lead-acid require different handling. In addition, the size and weight of the batteries/rechargeable batteries also play an important role in practice - after all, there is not unlimited storage space on a boat, but the charging times should not be underestimated depending on the circumstances (e.g. solar cells). The aim is therefore to get as much energy as possible out of the most compact pack size possible. We have summarized the most important battery types for you:

• Lithium: Lithium batteries are lightweight, powerful and particularly often rechargeable batteries that are ideal for use as boat batteries. They can be discharged particularly deeply (compared to other battery types) and can therefore be used very flexibly.
• AGM: proven battery technology, ideal as boat batteries for boat engines. AGM batteries are very inexpensive, durable and versatile – from starter batteries to batteries for continuous electric motor operation. A very good compromise for those who find lithium batteries too expensive, but you want to have significantly more charging cycles than classic lead-acid, as well as many more resources, since discharges of up to 80% without battery damage are common throughout.
• Gel: the technology is actually considered obsolete, gel boat batteries are much heavier compared to other types of batteries and actually too expensive to operate boat engines. Lithium or AGM batteries are preferable to gel batteries.
• Lead-acid: the classic supply of boat engines, and also the cheapest variant – yet far fewer charging cycles than AGM or lithium and only 50% discharge before the battery may be damaged. Batteries with lead-acid are available in many different designs - from unusable to quite suitable for the operation of electric boat engines (from unusable to electric boat engines).