We released new 3D-printed capsule handles in late November 2019 with a USB charging portal integrated into the capsule handle shell design. To access the charging port, simply turn your capsule light to align its usb charging port with the portal on the shell.
Pro-tip: To avoid getting dirt/dust in your capsule light when not charging, turn the shell, so the USB port is not exposed.
The new design is much improved - if you'd like to upgrade here are the links: