Resurrecting a SRT6KXLI with Error P.05

[Anonymous user]

Hi everyone, thanks in advance for all your help and ideas.

I am resurrecting a SRT6KXLI with dual APCRBC140 battery packs that was retired because of a constant Power Sys Error 00020 fault that has now been resolved by upgrading to the latest firmware, UPS 05.1 ID1013, per this post 

I am now getting the following errors:

P.05 contact customer support

Connect battery, backup not available

and Internal comm fault 154 in the logs 

I suspect that the battery packs are now beyond reviving and that the UPS is telling me to get new ones.  Before I go and throw a lot of cash at buying 2 new battery packs, can anyone share some insight into the P.05 and Fault 154 please?

Thank you