Neptuneninja0 wrote:The factory battery that I removed absorbed very little energy when I charged it outside the car. It had sulfuric acid all over it so whatever that means, maybe the leaf had at one point tried to overcharge it.
The NEW battery runs well. Yet, when I run the new charger over night, the damned thing never stops charging. The AGM is only rated on the sticker for 35Ah. the formula in the charger's manual says even at very low state-of-charge, my battery should be full in 21 hours.
Flooded Lead Acid (FLA) batteries are sometimes not easy to diagnose without checking many things, but it is possible that your battery failed with one cell shorted out and/or went dry and became essentially "open" circuit - but will not charge in either condition.
If you have a DC voltmeter, you can check across the battery terminals under various conditions to determine if you actually have a problem with the new AGM battery. You can search this forum for very detailed information from others about how the 2013 model charges the battery. I believe that the Leaf's charging profile is a little better for AGMs than FLAs and is likely to be OK if you use your external charger anytime you do not drive for several days or even weeks. The only "worry" that I have about using AGMs, is that the Leaf's charge profile will go above 14 volts for relatively short periods of time. I know that "small" AGMs have very cheap venting systems and will dry out if charged above 14 -14.5 volts for any length of time. Get a VOM and take some data and let us know.
2012 Leaf SL; 43,000 miles. Battery replaced November 1st, 2016.