... More specifically, in Pitea in northern Sweden. You can tell that the battery in the morning has a lot more power. I mostly go short distances (about 5 km), but shortly after the installation (ie, more a Connecting) I drove about 1000 km at the piece; has done well determined the battery. I am absolutely satisfied! Similar products cost about 60 euros, so I wanted to test it first. Okay, the minus 30 degrees in January / February, I could not try, but we had in November for a week already at least minus 15 degrees, and there is no problem. The car is a Passat. 1999 and the battery a Vartabatterie, with approximately 6 years 'the hump'. That was also the reason the acquisition in September, when it was colder and the first time had frost, the battery has weakened, and I was worried. Here in northern Sweden, it is customary to equip cars with electric heaters and to hang the car into the wall outlet with timer and frost guard. These 200 Euro investment I wanted to save.