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*** NEW VERSION AVAILABLE FROM BUPLABS.COM *** We now sell complete kits and accessories at www.buplabs.com. These DIY parts will still be available here, but you can get the latest and greatest directly from Bup complete with all hardware and accessories.
This battery holder sleeve is for the Shimano Di2 internal SM-BTR2 or BT-DN110 battery. This battery fits inside the seat post but typically requires a seat post made specifically for Di2. The holder sleeve allows the battery to be held securely within a non-Di2 specific 25.4mm seat post found on many Cannondale bikes from 2014 to current. It will also fit other seat posts with the same inside diameter.
This model is for a 25.4 mm seat post with a 19.5mm inside diameter.
IMPORTANT NOTE: We make Di2 battery holders for 25.4mm seat posts with 19 mm, 19.5 mm, 20 mm, and 21 mm inside diameters. If your measurement is close, pick the smaller size. If the measurement is more than .5 mm from the available sizes, or an odd shape, contact us for a custom version. There are also versions made for 27.2 mm seat posts with various inside diameters.
To use this holder, simply spread the holder at the long seam while inserting the battery, with the battery connector end facing the thick lip. Continue inserting the battery until the battery is fully inserted and touching the inside of the thick lip. There is a smaller internal lip that holds the battery in place. Ensure that the battery is locked into that lip, and not simply pressed up against it. If the battery retracts easily from the holder, that means it isn't inserted fully and is not locked in. After the holder is attached, insert the battery holder assembly into the seat post. It will require moderate force to insert when you reach the splines. Once the battery is inserted, it cannot be easily removed by hand. Use a pair of pliers to grip the thick lip to pull the battery back out. DO NOT pull the battery out by the battery connector! Retraction is easiest by gripping the holder sideways, and twisting it out until it is out about an inch. It can then be removed by hand.