There are frames that usually have a catcher for the Di2 battery in the bottom bracket area in the transition to the down tube. These frames are usually recent. And if you want to continue riding a frame that has been around for a few years and want to tune it for Di2, you will quickly start to wonder where the bar-shaped battery should go. With a conventional seatpost, the battery fits in without any problems - but with a dropper post, there is no "hiding place".

Based on the Di2 mounting aid for the seatpost, tune, the lightweight construction expert from South Baden, has developed a Di2 battery mounting device for the steerer tube. This means that the days of construction foam and similar tinkering are definitely over. The noble helper called "energy carrier" can be slipped over the battery rod and places the Di2 battery in the steerer tube without vibration. The weight of the part is kept to a minimum, as it consists solely of two aluminum plates, two screws and a silicone ring and weighs an extremely modest 14 grams. All that remains to be done is to connect the battery in the suspension fork steerer tube to the rest of the drivetrain using a cable...

www.tune.de