Edison Batteries

It's been about 36 years since the military initially sent me to school on Lithium batteries, and during that training we spent a couple days on Nickle based batteries, with a large part of that Nickle Iron. They've been around a long time, and are well tested. They are useful in some situations, but I can't see them being of much use for an RV. Characteristics that make them a bad choice for RV's would include. Heavy, high ventilation rate of hydrogen gas resulting in needing to be topped off often, very low charge efficiency of only around 60 percent, high self discharge rate, very slow to charge, voltage the drops considerably as SOC drops, and poor ability to sustain even moderately high discharge rates.