Only if the device has its own charging circuit. Thermal scopes and monoculars with a USB port manage their internal battery themselves, so a USB charger like this one is fine. Loose lithium cells are different and belong in a charger made for that cell type.
They do. Loose 18650 cells need a dedicated lithium-ion cell charger that stops at the right voltage. This 45W charger powers devices through their USB port, so use it for a scope or monocular that charges over USB, not for bare cells.