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I think we have found that what was wrong was the way Ford's 12v battery management system was handling the 12v battery charging. Recently, in another thread, some are reporting very high charging currents which could damage the battery, even after getting the updates. My thoughts were this...

My thoughts exactly! Even if there is a temporary power outage, when the power comes back on, the battery trickle charger will start up again - the NOCO GENIUS1 has a memory so it should go back to the AGM mode - mine always does when I take it off to drive and put it back on.

Assuming those high charging current measurements people are reporting are really the battery charging current and do not include the DC-DC converter powering other 12v systems, then I would say the battery involved is deeply discharged, and may (probably) become damaged by the high charging...

Right I think it says to completely disconnect the 12v battery if it is for a long time. And to put the HV battery at around 40-50%. If you completely disconnect the 12v, when you reconnect there is a procedure you have to go through to recalibrate the battery control system - it is described...

Thanks. Yea, I dug in to the whole thing a little deeper and see I had assumed a couple things that did not pan out. The BMS sensor is just a sensor/calculator giving the rest of the battery control system the information needed to control 12v battery charging, so it does not act as a...

Yes, after my ID theft back in 2007 the IRS got around to issuing PINs, been using one ever since.

Good advice. Been there done that too. All my info is on the dark web since 2007 due to my insurance agent's employee who installed a file sharing program on her PC (Limewire), on his network where an unencrypted file with my info and about 2000 other atty's info was, including Justice Breyer...

It is all Ford's fault for having made such limited information available to us owners. I think you'll often find that there are no 'dumb questions' and plenty of 'good answers' to choose from around here. Sometimes we just make educated guesses because Ford doesn't make it easy to know for...

Thanks for the linked document. I had seen the "300Wh" written as 300W in another Ford document or video which seems to have been an error. Yes, nowhere does that document specify the charging current. If we assumed the standard max current of 30% of 35Ah, a charging current of 10.5A, and a...

If you don't have your 12v battery on a trickle charger (with an AGM mode) the 12v battery is probably going to get too low and not last very long (based on the many posts about replacements in Lightnings) because apparently the truck simply does not do a good job of keeping it topped off. I...

I think the current that is being measured and reported on the graphs is MORE than just the battery charging current. If the truck is ON, then there are all kinds of other 12V systems running, battery and converter cooling, the computer, etc. and they are being power through that line you have...

I think it means it is available for the 12v systems (outlets etc. for after market items is limited to continuous 55A) and maybe for the other on-board things like AC etc., not for charging the battery - that number has always been 300W, which at 14-15 volts would be at most 20A. The dc-dc...

Oh that's the conversion of the ammeter, I see. Going down to so low an SOC is another negative for the battery lifespan, assuming the current really goes to 52A. 56% of 35Ah = 21Ah and 79% of 35Ah = 27.65Ah so 56% to 79% in 15 min is: 27.65Ah - 21Ah = 6.65Ah in 15minutes, or 6.65Ah...

The HV battery likely will do most of the work from what I have read, L1 just does not provide enough energy on its own. Having the L1 won't hurt in other words. Electricity will be not 'wasted' per se - I mean some is always 'wasted' in resistance losses in the wiring and in the on-board...

Just hope mine lasts the 8 years+

Got mine, comes with a case.

Hmm, never seen that on mine, but there are probably variations among the builds - I bought mine new in the box on eBay in Jan 2024 so a 2023 model FCSP I suppose.

Others have had good results with the Ford Team, but not sure of their contact info.

All 12V lead-acid batteries prefer to be kept at a high state of charge, ideally 100% to prolong their lifespan. Deep discharges cause sulfation on the plates, which can permanently reduce the battery's capacity over time. How to maintain a high state of charge Avoid deep discharges...

Yes the fixes (hardware and software) helped, but every lead acid battery lasts longer on a trickle charger, and batteries are not cheap anymore. I have my 2012 Nissan Leaf 12v on a trickle charger (bought the Leaf Dec 2011) and the 12v batery is still going strong - they love to be at 100%...