Well, that's where the Battery Stem comes in. Created by South Korean startup PiBike, the water- and dust-resistant Battery Stem is simply a 100-mm handlebar stem with an integrated 10,000-mAh ...

Weight-wise, there's a slight penalty. The 120-mm stem we were using tipped the scales at about 290 grams, whereas the conventional stem that it replaced was more in the neighborhood of 140.