Lithium is here and the cost is finally where it needs to be to replace lead acid. LiFePO4 is the most stable right now and is used in the BYD trucks. At least the last time I checked. Standard warranties are 5 years or 3,000 CYCLES (Not hours) a cycle is usually 10 hours vs. 8 hrs holding an 80% depth of discharge. There is no maintenance, no battery changes and the performance of the truck does not slip like lead acid. In reality these batteries should perform for 10 years and they have in other countries. At 2 times the price of lead acid it is crazy to not look at this technology. They perform in temperatures down to -5 degrees F. Lead acid only goes down to 32 degree F before performance drops off. They would replace about 4 lead acid batteries and have all the other perks mentioned. They are sealed so they are better in the food industry. They all have battery monitors and are extremely safe. Interesting conversation.