Nope, you need the same account as the app uses as this addin tries to replicate the app behavior to access a API that is still not open for public. It was promised ages ago, but still they were not able to just hand out some official API documentation and are quite uppish if you try to report some misbehavior to them.
Regarding your login problem. If the app does not login, too then your problem is your account. There was a PKCS12 / passwort error problem in the previous version, but it is fixed and the app works fine again. (Except a lil bug in the Charge Control feature. To fix that you need to chnage the addin options line to: -r --web-conf -c)