Portable power stations - the large type with AC outlets - typically utilize lithium-ion or lithium iron phosphate (LiFePO4) chemistries. I haven't found any which use NiMH.
LiFePO4 batteries are often advertised as having a "low" self-discharge of 2-5 % per month.
I am interested in a portable power station with a minimal self-discharge rate but ideally still rechargeable. This could be useful for e.g. an off-grid location. I noticed LiSOCl2 but it's not rechargeable.
I noticed that Sanyo Eneloop 5th generation NiMH batteries advertise 70% charge after 10 years (see https://en.wikipedia.org/wiki/Eneloop#Variant_comparison_tables) but I can't find any larger power packs that use something like this.
Is there a technical reason there's no larger power pack of NiMH available on the market? I'm not an expert on batteries and such - how hard is it for an amateur to create a DIY power station from a bunch of AA Sanyo Eneloop batteries? Ideally it could provide an AC power outlet similar to the LiFePO4 portable power stations.