Jeez that's alot of plugs and bolts to remove just to replace a battery...
and $300 for a new one?!
FYI: Don't store batteries on concrete floors, best to keep them at least a inch off the floor or on a shelf.
I can change two 28 volt batteries in a 757-200 quicker than it would take in my car...
Open access hatch, disconnect temp sensor cannon plugs (one each battery) cut copper safety wire off knob, turn em halfway and off they come, unscrew the two bottom retainers knob and they slide out.