I’ve been using an Ikea Markus for about 15 years, which I’ve been really comfortable with and is not super expensive. It’s not massively adjustable, so if it doesn’t fit your body shape, it might not be for you; but at the same time, it’s fit me and works really well and has enough adjustment that I’ve been able to shift through quite a few different changes in my life over that time. The ‘pleather’ is flaking now, and the padding has completely collapsed, but I’m looking to replace with another one of the same because it’s been good to me, which is probably the highest rating I can give something… it’s worn out from massive amounts of use, and is now due for replacement with exactly the same product.
Sodium Ion battery cells (From the article):
Lithium Polymer (From Harding Energy - https://www.hardingenergy.com/lithium-2/ - assuming this is representative)
That feels to me like the reported characteristics are on-par or better. Whether the real-world characteristics are the same, and if they really last as long is an open question.
I’d love to find out the Wh/l - i.e. how much physical size is needed to store the same weight of battery. It’s not such an issue with the likes of an e-bike, or even so much a car, as there’s spaces to shove it, but in something like a phone (Especially when people are so fixated on ‘super slim devices’ to the detriment of all else), if it’s 2 or 3 times larger physically, I can see it not catching on in those areas.
Searching on the Wh/l for Sodium batteries, I found nothing that seemed authoritative.