can LiFePo4 be totally discharged (from a dealer)

I’m not sure why he chooses to use the word ‘Lies’?? After watching his presentation, seems to me like an overstated use of a ‘trigger word’ to illicit audience clicks, while in the end he’s merely providing some fair minded information that might seem self-evident in actual practice…Another case of unnecessary hyperbole (trolling confirmation bias??) subsequently cloaked within some facts…’Viewer Discernment Required’…

Either way, in the ‘real world’ of drop-ins, the actual battery capacity can often be slightly greater than even the mfg’s advertised spec’s - Case in point: my LFP bench test at 7% over mfg’s spec capacity, so even at an indicated zero SOC, 7% capacity remains in reserve (meaning longevity unaffected), suggesting the advantage of bench testing…FWIW, I’ve even brewed the Keurig at 125amps at zero % SOC…

A 20% SOC BMS Cut-out, really?? (why so??)

3 tons

I have read from a number of other sources that like wet batteries, the depth of discharge greatly influences Lithium battery life.

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

Easy to have the BMS cut at 20% capacity if you build your own.
Can sit at 20% for 6 to 12 months without issue.
Dealer proof ;)

Agreed, sounds like your Sales folks need to be acquainted with the concept called ‘Lot Rot’ and parasitical drain - waaay cheaper than replacing perfectly good batteries…Most Sales folks I’ve encountered have never even owned RV’s…

3 tons

Clearly even those in the RV sales industry don’t understand batteries. How can we blame the newbie RVer?

I find it odd that as an LFP battery dealer there was not some well detailed charts or data presented.
Not much on the Mtech website either. No mention on how to get the most out of the batteries.
Amateur clickbait.

I fear for folks who invest thousands in Li and don't have a clue.

pianotuna wrote:
I fear for folks who invest thousands in Li and don't have a clue.

Well it’s an issue not exclusive to any one battery type, nor to exempt even costlier SiO2’s, eh??

3 tons (So much for battery fear porn…)

I think he is causing even more confusion with this video in saying that the cycle life is usaly rated at dod of 80% every LFP cell I have looked up it is rated at 100% depth of discharge and after the 2500 to 4000 cycles (depending on the battery manufacture) it is still guarenteed to have 80% of the original capacity left , unlike lead asid batteries which normaly are done when the cycle life is over.

then theres the fact you have found another store video which is nothing but a guy trying to make himself sound smart and honest by misleading so he can sell you more batteries than you need claiming 80% capacity.....