I was so disappointed when I tried these out, I bought size small as I have really small hands , and my hands are smaller than the measurements for small, but with the battery pack fitted it’s a real struggle to get my hands into them.
With the battery pack vertical I can just about get my hands in, with it horizontal I can’t get my hands in at all.
I have Ehlers Danlos Syndrome so pulling to get my hands out pulls my finger joints out of place which is really painful.
A bigger size isn’t an option as they would be way too long, I will keep them as they are lovely cozy gloves and hope that at some point a slimmer battery may become available.