Lithium batteries outperform AGM (Absorbed Glass Mat) batteries on numerous levels. Lithium-ion batteries provide more power per weight and volume due to their higher energy density. They also discharge faster, allowing for higher depth of discharge, meaning an increased amount of usable electrical energy. More effectively, lithium batteries possess a greater cycle life by enduring more charge-discharge cycles without suffering significant degradation. AGM batteries do tolerate over-discharge better and may be cheaper initially, but in the context of sustained and reliable service, lithium is superior for high-performance, long-term applications.