NiMH were incredibly annoying back when I last messed with RC cars, which was when NiMH was the latest and greatest battery chemistry in use there. They rarely

NiMH were incredibly annoying back when I last messed with RC cars, which was when NiMH was the latest and greatest battery chemistry in use there. They rarely delivered in practice what was in writing quite promising capacities, and they were incredibly delicate when it came to heat. The wikipedia page for NiMH also mentions things like venting hydrogen gas when overcharged... Looking through the LiFePo4 pages on wikipedia the safety and durability profile seems superior to NiMH, but maybe the LiFePo4 pages there are just fixated on vs. other Li-Ion chemistries. My impression ATM is if you've got LiFePo4 available it's preferable to NiMH. And my personal experience with a LiFePo4 portable battery booster for jumping cars and emergency charging stuff has been an incredibly positive one. The thing is like a tiny weightless magic box that tolerates incredible abuse without losing any charge even stored for a year in desert temps, and somehow manages to put out enough current to start large-displacement high-compression V8s.