I believe the Kinetiks are Absorbed Glass Matt batteries.
All AGM batteries are succeptible to damage when overcharged.
Check with the seller what the most voltage he's ever put through
it. Find out the duration and how many times he overcharged it.
Overcharging will cause water from the electrolyte to vent
which will lead to an early failure. Rapid charging will also cause
premature failure.
Remember, these batteries do not have a lifetime of operation.
Ten years if used properly. One of the best ways to determine
a used battery's potential is to ask the seller details on how he
used, cared and stored the batteries. Batteries should always be
stored above its float charge and raised off a cold garage floor.
If the seller let the battery sit for an extended period of time, the
battery may have already suffered what is known as calsification.
If that has happened, the damage is irreversable and there is no
way for you to test for it in one visit even if you have a DDM.
The price seems very attractive but be cognisant of its irreversible
potential damage.
Ren/Octane
