UPS MAINTENANCEEaton 5115 Rack-Mount UPS (500–1500 VA) User's Guide 164201449 Rev B www.eaton.com/powerquality48Storing the UPS and BatteriesIf you store the UPS for a long period, recharge the battery every6 months by plugging the UPS into a power outlet. The batteries chargeto 90% capacity in approximately 3 hours. However, it is recommendedthat the batteries charge for 6 to 24 hours after long-term storage.Check the battery recharge date on the shipping carton label. If the datehas expired and the batteries were never recharged, do not use theUPS. Contact your service representative.Replacing BatteriesNOTE DO NOT DISCONNECT the batteries while the UPS is in Battery mode.With the hot‐swappable battery feature, UPS batteries can be replacedeasily without turning the UPS off or disconnecting the load.If you prefer to remove input power to change the battery, see “Turningthe UPS Off” on page 36.Consider all warnings, cautions, and notes before replacing batteries.W A R N I N G Batteries can present a risk of electrical shock or burn from high short circuit current. Thefollowing precautions should be observed: 1) Remove watches, rings, or other metalobjects; 2) Use tools with insulated handles; 3) Do not lay tools or metal parts on top ofbatteries. ELECTRIC ENERGY HAZARD. Do not attempt to alter any battery wiring or connectors.Attempting to alter wiring can cause injury. Replace batteries with the same number and type of batteries as originally installed inthe UPS.