Buying a set of batteries for your home is a big investment and there is a lot of choice out there. It is also probably a better purchase to benefit the environment than buying an EV.
I have had batteries on my house since early 2014. Now on to my second (and final) set. First set were Deep Cycle Lead Acid that was all that was affordable at that time. I expected 10 to 12 years from them but, due to other problems, they only lasted 6 years. It only took one cell in one battery to fail and the whole lot needed to be replaced. This is one of the big failing of Lead Acid in that you cannot change out one faulty battery. They also are not tolerant of deep discharges and do not have a great lifespan.
When they died I needed to replace them. I was already looking into this and was interested in some Nickel Iron cells. The drawback with those was the high internal impedance, especially when cold. So putting on the Kettle and Toaster on a frosty morning can result in a blackout or switching back to grid. At this time the Musk Stick was promoting the LIon sets. I considered those, and they are also the most popular choice now, mainly due to their being used in all the EV's. They have a distinct advantage for mobile applications as they are very energy dense, so less weight for the power delivered. For a home installation they do have some problems where the density is not an advantage. They can suffer from Thermal Runaway and result in a fire which is almost impossible to extinguish and their lifespan is also not the best.
Looking around I found the cells which tick the most boxes were the LTO Cells (Lithium Titranate) which I now have installed. They use Lithium but in a much more stable chemistry. They do not have thermal runaway issues and have a very long lifespan. The lower density is not an issue in a static installation.
The set I have should last longer than me, with an expected life of 50+ years and a warranty of 20 years that they will be better than 90% of new capacity. At the time I made the purchase these batteries were about the same price as the LIon cells, but they have come down a bit since. I still think the LTO are better value as they have many advantages over other cells.
If I had the funds I would increase the capacity of my batteries. I currently have 4 x 1.93 KWh = 7.72 Kwh but I would like to make it 6 units and 11.58Kwh storage.
What have you got or are looking at?
