>DOA Pb battery

The symptoms indicate a battery that was stored improperly (in a hot
place) and has dried up or discharged completely. Try to charge slowly for
14 hours at 1/20 C. If by then the Ri and voltage are not nearly
reasonable then return the hulk imho.

A new sealed lead acid should have nearly nominal voltage (slightly less
is ok) and be able to give 0.5C current without noticeable voltage drop
(drop < ~20% of open voltage) for 10 seconds or more. It should be cycled
once before use (slow charge -> slow discharge -> slow charge -> use) for
best results, unless the manufacturer says otherwise.

Peter

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