An alkaline battery comprises an electrode. The coupler also has a second waveguide including a second core and a second cladding, the second waveguide having a second effective refractive index different from the first effective index and being in substantially close proximity to the first waveguide in a predetermined region to provide coupling therebetween. A releasable lock pin engages and secures the ball within the ball housing in a mowing position or a service position. When the operator pulls the saw housing toward the drill, the spring is compressed and the gears are engaged, thus allowing the saw to operate. A corresponding transverse outlet conduit may be provided.