My take on the video is what I KNOW and have experianced for both Li and AGM batteries for the past 10 years. LI are GREAT as are AGM's. BUT you can fully discharge a Lead acid DEEP CYCLE battery and as long as to do a slow steady recharge the battery will resume almost 100% efficiency. It has lost some of its life cycle, but minimal. Li and AGM, you completely drain them dead and leave them dead for more than a few days, well you now have a very heavy small boat anchor. They will NEVER recover their life cycle or even stay charged. This has been a big headache trying to get the idiots in our sales dept to keep our B vans that now come with LI(used to be AGM) plugged in and charged. They rant and rave when they have to buy NEW batteries for when they sell that Motorhome and we try to educate the Sales manager, but they keep buying new batteries because WHY? Because the Makers of the Li and older AGM KNOW the only way a NEW battery could be bad because they were allowed to discharge completely. Doug
