Is battery recharging required for a UPS that has been stored for a long period?

Yes. If a UPS is stored for an extended period without use, the battery requires
periodic recharging.

Failure to recharge the battery during storage may significantly shorten its service life. Recharge the battery according to the UPS storage temperature conditions.
For the recharging procedure, refer to the "Precautions for Use" section of the
instruction manual.