Get Benjamin Franklin to go back to the motel
As Hoagie, leave the lab and head to the first floor of the motel. Open the first door and enter Geroger Washington's room. Push Gerge's bed on the right and use the cord near the door to call the maid. When she appears. Go to the corridor and approach maid's cart. Take soap from it, go downstairs and go to the kitchen through the fireplace room.
Use the bucket that you have in your inventory on the water pump in the corner. Now, use soap on the bucket to make a bucket full of soapy water. Leave the kitchen and go outside, to a carriage standing outside. Use the brush that you have in your inventory. When you start cleaning the carriage, clouds will appear and it will start raining. Hoagie will make a comment about the rain. A while later, you will see Benjamin Franklin running to the motel.
Find material for the kite
Go inside the building and head to the first floor. Go through the third door to Ben's room. Try to talk to him and you will learn that he is busy with some historical project. If you try to give him any item from your equipment, Franklin will tell you that unless it is a light, waterproof material, he doesn't need it.
Leave the room and go downstairs. Go through the clock to Red Edison's lab. Now, switch to Bernard and send Hoagie the help-wanted sign). Switch back to Hoagie and give the item to the scientist. Edison will ask you to help him finish his work. Take the lab coat from the stand. Go back to the first floor, to Ben's room (the third door). Give him the lab coat. Franklin will get to work, commenting the inventions of Red Edison.
Charge the Super-battery
After a while, you will find yourself on a hill, with Franklin. You will be testing the kite. When Ben goes away and signals you to start, you will have the opportunity to charge the battery. Quickly use the battery on the kite and push it up before Ben starts saying something. If you don't do it quickly enough, Franklin will go back to talk to you. After a while, you will have another chance.
When you manage to do it, a lightning will hit the kite and it will charge the battery. When leaving, Franklin will leave fully-charged battery on the ground. Take it and head to the motel, to the time capsule. Use the battery on the plug, which will bring back power to Hoagie's capsule.