Pinhe_Fil, Would you confirm if the server is up to date on BIOS, iDrac, as well as the perc controller? Also, when you replaced the battery, will you confirm if you installed the battery and then allowed it time to charge before powering on the server? Lastly, what model perc controller is installed?   Let me know.  
Dear team  Our RHEL7 box System Event Log reports warning 'The PERC1 battery is low', as you see in the logs, we experienced this issue within 3 months, and we have replaced PERC1 battery twice which on Aug 13 and Oct 22 separately.  [IMAGE] below screenshots are the verification after a new battery replaced on Oct 22, as you see the status of battery is green after we check in 4hours, but we got the same warning after 4hours.  please kindly advise. thank you ! [IMAGE][IMAGE]    
PowerEdge R730 PERC1 Battery is Low after replaced a new battery