Vexilar 2.5 AMP Rapid Lithium Charger Only [V-420L]2. 5 AMP Rapid Lithium Charger Only This 2. 5 amp hour rapid charger is designed for Vexilar Lithium batteries ONLY and works best when connected directly to the battery terminals using the supplied Gator clips. As the RAPID name implies, it is the best choice for many of the higher amp 12 volt batteries that you need to get a charge into quickly. The easy to understand charging lights make charging a snap. Green light signals to power or charge