Li-ion batteries are charged typically in controlled and contained setting within the UPS. Lithium batteries have a slightly better charge efficiency, so they will reach that level slightly sooner. But to go from 80% to 100% state of charge, the lithium-ion battery is far better. A Li-ion battery will reach a 100% SOC in 30 minutes to an hour assuming, of course, that the UPS is capable of supplying the power to charge at this rate. Regardless, it will be 5-10 hours less than charging a lead-acid battery system to 100%. Lithium-ion batteries have very low maintenance requirements. There is no fluid level to measure and maintain (nor is there for valve-regulated, lead-acid batteries). There is neither battery “memory” to be concerned about nor any need to periodically cycle the batteries to calibrate their runtime. And their long life span of 10 or more years reduces the need to have to replace them over the course of the UPS’s period of use. By the time the batteries need to be replaced, it is likely time to replace the UPS as well. The included battery management system (BMS) automatically collects and reports all the required data to accurately understand the battery system’s health and status which further reduces maintenance burdens.