to the one or more devices 30 30 a 30 b from an electrical storage element 56 a activity 406 a and provide an indication of the electrical storage element 56 a via the user detectable signal generation device 358 a activity 406 a 408 a when sufficient power is provided by the external power source 20 a and the electrical storage device 56 a is not fully charged activity 412 a the method 400 a may charge the electrical storage element 56 a activity 414 a and provide an indication of the electrical storage element 56 a charge level via the user detectable signal generation device 358 a activity 416 a further when sufficient power is provided by the external power source 20 a activity 402 a and at least one device 30 30 a 30 b is coupled to the mdpp 340 540 activity 422 a the method 400 a may provide energy to the one or more devices 30 30 a 30 b from the external power source 20 a activity 424 a and provide an indication of the existence of power from the external power source 20 a via the user detectable signal generation device 358 a activity 426 a further when sufficient power is provided by the external power source 20 a activity 402 a and a second mdpp 140 b 240 b 640 b activity 428 the method 400 a may provide energy to the 2nd mdpp 140 b 240 b 640 b from the external.