This will not work with the old Mint 4200 or 4200A. In this review a lot of people say it matches Mint so I bought one but I think my Mints (I have two of them) are too old. So, owners of the old Mint, be careful and check which model you have. Or look at the connection part of your Mint battery. This battery has a 5-pin (? I don't know what to call it.) connector as you can see in the product image, but my old Mint battery only has a 4-pin (?) connector. I have to return this battery, but I didn't test it myself before buying it, so I'm giving 4 stars so as not to blame the product.