A powerful, waterproof and intelligent battery charger with a customizable seven-step charging algorithm suitable for a wide range of battery types and chemistries and incorporating a dedicated lithium-ion charging algorithm. The wide universal input voltage provides flexibility to the installation and the charger maintains its full output power regardless of where it is placed in the world. The IP65 rating makes this charger particularly suitable for marine, mobile and industrial applications and it withstands harsh weather conditions such as heat, humidity and salt air.