* navti wrote, On 5/30/2007 2:29 AM:
UPDATE UPDATE UPDATE

Both Batteries were charged on full last night for 3 hours .
I put some lights on them for 2-3mins before checking voltage to
remove the surface charge (as advised by Ken Heaton).
They showed 12.69V and are sitting steady. Will leave them to settle
until till tomorrow evening then start using them and try and figure
out their performance over the next few days.

This means they are not totally dead. Only a load test (which could
simply be running a bright light for a while) will tell if the
capacity is seriously diminished. Unfortunately, the capacity could
be well below 50% and they would still behave like yours. With
traditional wet cells, the electrolyte can be sampled, making this a
bit easier. With AGM's you really have to measure how much they can
deliver before the voltage gets too low. Each battery is a bit
different, so there's no formula that says if "10 Amp hours drops the
voltage 0.1V, you have X capacity." You should get guidance from the
factory - they may be able to give a procedure that would be far more
accurate than the guesses you get on this board.