Mounting a water bottle on an e-bike can be challenging. Many e-bikes mount their battery on or inside of the down tube making it impossible to mount a water bottle there, as is the case with my wife’s Trek e-bike. Instead, Trek placed the water bottle mount under the top tube making it awkward to remove and replace a water bottle in a standard cage. Fortunately my Cannondale e-bike has a water bottle mount on the down tube on top of the battery and another on the seat tube. However, if a water bottle cage is mounted on the seat tube, there isn’t sufficient room to remove the battery. I guess Trek and Cannondale don’t use their bikes or they would have recognized these shortcomings.
Struggling to find a solutions for our water bottle dilemma, I found the Fidlock water bottle system. While it seemed insanely expensive, it looked liked the perfect solution to your problem. So I paid the premium price for the system and one purchase one for each of our e-bikes. about $80. Boy did I make a mistake!
The Fidlock water bottle will only release from one side, so when it’s mounted on the down tube it is righthanded and releases with a twist to the right. When it’s mounted under the top tube or on the seat post it’s lefthanded and releases with a twist to the left, as pictured on their website. Since I am righthanded, it is unnatural for me to reach down with my left hand and twist a bottle to the left to remove it from my seat tube. Compounding the problem for me is drinking from a bottle in my left hand and returning it to the holder with my left hand. Cycling is dangerous enough, without trying to become ambidextrous while grappling with a water bottle on my bicycle.
Bottom line: I cannot recommend the Fidlock Water Bottle.