So, it’s well-known that lithium batteries lose capacity when temperatures drop well below freezing. However, since they generate some heat while discharging too, it seems logical that insulating the battery to retain this heat could help extend range in cold weather. My question is whether this makes a noticeable difference in real-world use?
I’ve been browsing eBay, but most covers seem to fall into two categories: uninsulated rain covers for external batteries or neoprene sleeves for built-in ones. My fatbike has an external battery, so I quickly jerryrigged a cover using a 20mm Armaflex sheet I had lying around. While it obviously didn’t hurt, I can’t say I noticed much improvement either.
Does anyone have long-term experience with insulating battery covers? I’d also appreciate recommendations for a good cover for external battery or tips on how to DIY one.
I think your use case won’t be enough difference any way you cut it. Range extension in freezing temps? Do you reuse all the way through your battery usually?
If you’re asking wether I regularly come home with an empty battery, then yes.
Why do you think “my use case” wouldn’t show a difference?
I work with bikes and I don’t think the amount of insulation you’d be able to fabricate will increase the ambient temp around the battery to increase efficiency or capacity in any noticeable way.