Lithium car audio batteries at Sound Solutions Audio: Limitless Lithium and XS Power lithium (LiFePO4 and LTO) batteries, 12 V and 16 V, from 12 Ah to 100+ Ah, for weight, voltage and current the AGM cannot match. Authorized dealer for every brand we carry, with real-world advice from enthusiasts who have been building systems since 2006. Fast US shipping, financing available, and support after the sale.