I décide to go lithium. My old converter charger will charge, but not at 14 volts. I decide to change for a unit that includes lithium charging. I have to mention that the owner manual does not explain the way to convert from traditional battery to lithium. I have to send a note to the company and they explain to me what to do. Maybe, several people don’t know the way to make the change and won’t understand why it take forever to charge, it’s because they don’t know that they have to set it manually. My suggestion, add a note in the box dear manufacturer.