The video is ok for the spreadsheet-like comparison, but it claims that all batteries have "memory". Also claims that depth of discharge doesn't matter to lead

The video is ok for the spreadsheet-like comparison, but it claims that all batteries have "memory". Also claims that depth of discharge doesn't matter to lead acid (what happened to sulfation?). One good point that was made is that lead acid starts to behave terribly after losing 20% of its capacity, to the point that they fail outright and can no longer hold a charge. Lithium can usually keep working way longer than that, just with a reduced runtime. Those cycle life numbers look great, but lead acid batteries in practical applications tend not to last the lifespan advertised on brochures. We can gauge that by how confident the manufacturers are: * The Trojan SIND 06 610 has a 2 year warranty. * The NSB100FT - 3 years. * The Battleborn BB10012: 10 years The Trojan battery weights a whopping 220lbs and holds 600amp hours. It's not even in the same category as the other two. You need a minimum of two as they output 6v. The price for the amount of storage they provide is pretty good though. > Lead-acid age by cycle count more than elapsed time, so you could have a battery last well longer than 10 years if you treat it well. Have you ever seen a lead acid battery last this long? Was it able to hold a meaningful amount of charge? Lead acid batteries may be cheaper but they are unlikely to survive for as long as claimed. That said - if you want a battery backup that you basically never use, there is a chance that you'll get a good return on investment on deep cycle lead acid (specifically those industrial ones) – if they don't fail for whatever reason and are properly maintained. For the same amount of money you can buy a ridiculous amount of storage for a real emergency. Good point about the recycle rate. Lithium is theoretically just as recyclable as lead acid, but the logistics are not there yet (but how will that look like in 10 years?).