I use your 9-volt lithium battery in musical gear but found that it has slightly larger dimensions than a conventional 9-volt battery.

Due to the unique design of aluminum battery housing, which has less-rounded edges than alkaline batteries, the 9V Lithium battery presents a fit problem in a small number of applications. Generally, the fit problem occurs in those devices that were originally designed using the actual dimensions and shape of an alkaline battery, rather than using the maximum dimensional standards established by the American National Standards Institute. Unfortunately there is no way for us to modify the shape of our battery to fit in such devices. We are continuously looking for alternative ways to get the same amount of power into a slightly smaller housing.