The best way to find replacement batteries for your electric heated socks is to determine the battery product number which is often available with the product specifications. By searching for this number it is possible to find a supplier who has affordable replacement batteries available.
Another good source would be the product manufacturer. While not all of the socks we reviewed were made by companies that have customer service departments, some of them do, and many of them are lovely people to chat with who wouldn’t mind finding a replacement battery for you.