For all those who would love to have the best of both, there is good news: You can! LE300 Smart Battery System is a plug and play lithium extension for existing 12 V lead-acid battery systems (that includes AGM and gel). Simply connect the battery cables to the positive and negative poles of your current battery and that is it. No programming, no changes to the electronics. It takes a couple of minutes.

What you get: More capacity and even more unique features. For example, an extended lifespan of your lead-acid battery by up to ten years. LE300 will also keep it fully charged during winter, even in standby mode. With the right lithium-lead ratio, you can simply forget about batteries during the cold months and get back on the water in spring.
LE300 is modular and scalable: You can combine as many of the 28 Ah modules as you want. Well, up to 24 of them. More than enough even for long excursions. The good thing: You can adapt your capacity whenever you need it. You could start with one or two for example and add more next year – just as you need and as your budget allows it. The German manufacturer BOS AG recommends a minimum of one module per 100 Ah of lead-acid battery. Each module of LE300 weighs 3.4 kg. Thus, they even fit into small boats.

Pricewise, the fact that you can simply keep using your existing battery plus charging technology is a plus. It means that for the total usable battery capacity, the price per ampere-hour is significantly lower than in pure lithium systems. Simply because you already own a part of your total capacity. And why throw out what still works? Keep what you have and add what you want, that is the core principle.

By the way: This is also useful if you are thinking about an additional lead-acid battery. It is not recommendable to connect new lead-acid batteries to used ones. With LE300, you do not need to replace the existing battery to get more capacity. Just install the lithium modules.