Portable power supplying device

A positioning sleeve for a telescopic rod, which has an outer tube section and an inner tube section connected telescopically to the outer tube section, said positioning sleeve comprising:

• a sleeve body having a first surrounding portion adapted to surround the outer tube section, and a second surrounding portion adapted to surround the inner tube section, said second surrounding portion having an inner peripheral wall defining a through hole, a plurality of angularly spaced-apart recessed parts provided in said inner peripheral wall, and a plurality of compressible retaining units respectively disposed in said recessed parts and adapted to abut the inner tube section, each of said retaining units being connected to one of said recessed parts and having an engaging part projecting toward said through hole, and a deformable space defined between said engaging part and a respective one of said recessed parts, said deformable space being deformed when the inner tube section is friction-fitted into said sleeve body and when said engaging part of each of said retaining units abuts the inner tube section.