It wasn't too long ago when rumors emerged that BMW is preparing a fully electric version of the 7 Series sedan to join the upcoming i4, iNext and iX3 EVs. According to BMWBlog, the electric 7 Series, which will reportedly be named the i7, will be offered with several different battery packs. Now, the same publication is claiming the i7 will have some significant power under the hood and one of the biggest batteries ever installed in a production car, allowing BMW to take on the Porsche Taycan.

Unnamed sources have revealed that the i7 will be offered in two different guises: the regular model and the i7S, with the latter delivering more power and range. Allegedly, the i7S will pack a 120 kWh battery and produce around 670 horsepower, enabling the electric sedan to deliver a range of around 360 miles based on the WLTP. This would make it the most powerful production BMW yet, exceeding the 617-hp M8 Competition.

On the other hand, the standard BMW i7 will pack a 100 kWh battery and deliver a total output of around 550 horsepower. Pure electric range is also expected to be around 360 miles.

Both models will likely use more than one electric motor to deliver these power outputs and also feature all-wheel-drive. For comparison, the regular Porsche Taycan boasts 670 hp and 626 lb-ft of torque, but the i7S will fall short of the range-topping Turbo S, which has 750 hp and 774 lb-ft of torque.

The Taycan also uses an 800V architecture allowing for fast charge times, so BMW would need to adopt a similar system to compete. The next-generation BMW 7 Series is expected to arrive in late 2021 or early 2022. Rumors suggest the combustion-powered variants will drop the current model's V8 and V12 engines in favor of a hybrid setup incorporating a 6-cylinder engine and electric motors.