Sure, this isn’t for everyone and you should always put the battery in the seatpost if you can, but this is a nice alternative. While originally intended to be used on mountain bikes, this works on road bikes too - several PRO stems have an opening allowing you to route an EW-SD50 wire from the fork steerer through the stem, into the handlebar. My new favourite solution is to put the battery in the fork steerer. I have one on my indoor/commuter bike and it works just fine… it’s just really big. Unfortunately this is a really chunky unit.

There’s also the SM-BTC1 of course - the bottle cage battery holder. It’s not often that you need to get to the battery, but personally I prefer to have it somewhere easily accessible.

Putting the battery in the downtube generally means that you have to take out the bottom bracket to get the battery and this can be a real pain. Others sometimes use an external battery instead.īoth of these are not ideal.

Some manufacturers put the battery in the down tube - like Canyon do on the VCLS seatpost equipped bikes. However, what do you do when you cannot put the battery in the seatpost? Because your bike has a suspension seatpost or perhaps a dropper post? Where do you put the battery? The seatpost is the ideal place for this battery and several brands make seatpost battery holders to securely hold your battery in place. Ever since the release of the SM-BTR2 Internal Battery years ago, people have been installing their Di2 batteries in the frame.

Carbon Fork Expander Installation