Remember, when you go to a Lithium Battery, you MUST activate or modify your Converter charging system to be compatible with Lithium batteries. You may even have to change the Converter to a Lithium type Converter. Same if you have an INVERTER/CHARGER. Failure to do so will result in your expensive Lithium battery failing and they will NOT warranty the battery if your charging system is not compatible. Lithium battery makers are so confident of their Batteries, that they will state failure can only be a user/charger error. Doug