H700 battery not charging

I have an internal H700 controller in an R410 purchased in 2011; I just upgraded the drives from SATA 7200 to SAS 6G 15k, but I noticed the cache was in WriteThrough mode.  Upon further investigation, I saw the battery had dropped below the warning threshold capacity.  I ordered 3 new ones (actually, they appear to be refurbs.....the Dell sticker has a mfg date of ~late 2015, but the MegaCli command reports a manufacture date of 2007).  After installing in the first server, it started a learn cycle as I expected it would, but said at the time the expected time to full recharge was around 20 hours....quite a bit more than the 4 I've seen other people report it "should" take.  Now, ~4 days later, it appears to have stalled, and is neither charging or discharging, and the state is unknown:

BBU status for Adapter: 0

BatteryType: BBU
Battery State: Unknown
  Battery backup charge time : 0 hours

BBU Capacity Info for Adapter: 0

  Relative State of Charge: 37 %
  Absolute State of charge: 25 %
  Remaining Capacity: 469 mAh
  Full Charge Capacity: 1275 mAh
  Run time to empty: Battery is not being charged.
  Average time to empty: Battery is not being charged.
  Estimated Time to full recharge: Battery is not being charged.
  Cycle Count: 19
Max Error = 2 %
Remaining Capacity Alarm = 190 mAh
Remining Time Alarm = 10 Min

BBU Design Info for Adapter: 0

  Date of Manufacture: 06/12, 2007
  Design Capacity: 1900 mAh
  Design Voltage: 3700 mV
  Specification Info: 8000
  Serial Number: 2656
  Pack Stat Configuration: 0xe4ac
  Manufacture Name: SMP-PA
  Firmware Version   :
  Device Name: X848376
  Device Chemistry: LION
  Battery FRU: N/A
  Transparent Learn = 0
  App Data = 0

BBU Properties for Adapter: 0

  Auto Learn Period: 90 Days
  Next Learn time: Fri Oct 21 18:39:16 2016
  Learn Delay Interval:0 Hours
  Auto-Learn Mode: Enabled

Exit Code: 0x00

I update the controller firmware to 12.10.7-0001 (from 12.10.1-0001) last night, and after rebooting it was in a charge period for a bit, but this morning it appears to have only reached its current 37% (remaining capacity has been at 469 mAh for awhile now).  Anyone have any thoughts to try to get it to charge?  I'd like to not have to go through the process of returning these, especially if they aren't bad and this is just a configuration problem.

Thanks in advance.