Editor’s note: Below is Part 2 of an article providing information on choosing and installing a LiFePO4 lithium battery system aboard a cruising sailboat. Part 1 appeared in our 2021 Ocean Voyager annual issue on page 8. Recently we removed 390 pounds of GEL lead acid batteries from our catamaran and replaced them with 100 pounds of lithium (LiFePO4) cells. The LiFePO4 batteries have almost twice the useable capacity and take up half the space. Our cells came from one of the many well-respected lithium factories in China. Most of these have been in business for ten years or more…