replacement P410 storage battery "not supported by the currently running firmware"

[justinpryzby]

On a customer's server, an proliant DL385 G6 with "smart array P410", we were alerted to a failing battery by the cciss_vol_status tool.  They originally ordered (and installed) the wrong battery part, for the G5 model.  They've obtained and just installed the correct battery, which spent ~90m charging, but now says:

Cache Status: Permanently Disabled

Battery/Capacitor Status: OK

Cache Backup Power Source: Batteries

Battery/Capacitor Status: OK

Cache Status Details: The cache is disabled because one or more attached batteries are not supported by the currently running firmware.

Edit: Battery PIC Revision 0x34

However, they're running the latest firmware.  What gives?

http://h20566.www2.hp.com/hpsc/swd/public/detail?sp4ts.oid=3949989&swItemId=MTX_e4dcf3a67274408a9a3f5bb1cf&swEnvOid=54

Running firmware: 6.60
ROM firmware: 6.60