If you are in the States or Canada, you can call them 24/7 and get a response immediately.  Every 90 days, the PERC's initiate a "learning cycle", which completely drains the battery, then recharges it.  During this time, write cache is turned off, an warning and error thresholds are tripped for the battery charge.  O would give it up to 24 hours; if it hasn't returned to optimal/normal status, then call Support.   If you want to confirm the learning cycle is responsible, the controller log will usually log when this event is going on.
Hi, Just got an email from monitoring system. WARNING: [XYZABC] Cache Battery 0 in controller 1 is Degraded (Non-Critical) [probably harmless]br/------ SYSTEM: PowerEdge R310, SN:XYZABC Checked Battery status under Main System Chassis-Good. However, battery status for H700 RAID Adapter shows Degrade state. O/p is pasted below.  This is PowerEdge R310. Firmware: BIOS:  H700 Adapter :  BMC:  What is there I can try myself before I contact Dell support?  This is just warning so obviously I am not going to call dell support but email them, and that I believe will take 2 days for me to get a response from them.. Thanks in advance. UG
DEGRADED Battery status H700 Raid adapter