If you were to store the Lithium-ion battery UPS, please remember the points below.
1: Lithium-ion batteries get more impact from the environment than a lead-acid battery.
2: If the Lithium-ion battery is fully charged, it becomes progressively worse faster. In other words, Lithium-ion battery deteriorates slower when it is less charged.
3: If a Lithium-ion battery is completely discharged, it will not be able to fully recharge.
4: A lower storing temperature is better for Lithium-ion batteries.