long as diode 33 prevents current drain when the cells are not in light inputting charge with power line 37 and ground lead not shown light from the sun or a lamp charges the battery through the solar cell energy absorption both charging circuits are common art in the electronics field and solar cells come with recommended circuit schematics the flashlight has switches 40 in the on position and switches 41 and 42 in the off position resulting in bulbs 60 being on and bulbs 61 and 62 being off giving a choice of pattern for bulb illumination as shown in fig5 b the power contact 63 and ground contact 64 from bulb 60 has a permanent power wire 65 and a ground wire 66 going through switch 40 here in the on position these wires meet battery circuit wires 52 to complete the circuit powered from the power and ground clips 80 flashlight encasement includes the hinged cover 90 over the plug prongs 5 as shown in fig5 a which contains a handle 95 that can be clipped to for belt or lanyard carrying this figure shows a practical application of the sheet battery substrate circuit board design it includes two means of charging the device both having their circuits on the sheet battery substrate this simple application gives the basics for using this circuit design for a wide range of applications as is shown with the flashlight in fig5 we have eliminated the ac converter by applying a trickle charging circuit which will allow only one direction of current from the ac power source and will slowly charge the battery from the wall plug also the simple accommodation of the solar cell with a single diode 33 allows the.