Yes, you can charge lithium batteries with solar charge controllers. In fact, many people do just that! Lithium batteries are becoming increasingly popular for use in solar power systems because they offer a number of advantages over traditional lead-acid batteries. For one, they are much lighter and easier to transport and install. Additionally, they have a higher energy density, meaning that more electricity can be stored in a smaller space. And finally, they boast a longer lifespan than lead-acid batteries, making them a wise investment for those looking to get the most out of their solar power system.