how to make a simple battery?
439077
If I remember correctly off the top of my head, you can take a lemon and poke a copper wire in one end, and a steel wire in the other end....
456553
That's not going to be an easy task.\nIt's not usually done.\n\nEbay has soldering tools, even SMT ones.
264255
First of all the physical care. Find an protective carry case, keep it from heat & cold & Water.\nIt is a good idea to let the battery run down the first few times and then recharge. I am told this is good for prolonging the life of the battery.
1126346
http://educate-yourself.org/fe/fejoewatercell.shtml\nI'm unsure of anything that describes how to really make one.\nThis site tries, but it's rather goofy to follow. Maybe you'll have better luck that I would.
103533
A simple voltaic device can be made with a piece of fruit and 2 pieces of dissimilar metals.  It won't run your house even if you have lots of them.  The juice serves only as the electrolyte, not the energy source.\n\nFor real power, you'd need to ferment and distil the juice and put it in a fuel cell.  There's lots of fuel cell info online.
358273
http://www.howstuffworks.com/battery.htm
704252
Just use four 12v car batteries in series = 48v, you can always hook them up to some renewable or rechargable source.
1179766
You could solder onto the positive and negative parts of the battery case 2 wires with a female AC adaptor plug.  Problem is that i have no idea what mA, voltage, wattage, ohms, etc to use there.  Check the battery and look for the electrical information, or check the manufacturer's page for some schematics.  About 3 years ago i ran an old computer that way after the battery died since i didnt feel like roaming the globe for a battery that fit.\n\nYour safest bet is the battery and if it died, replacements are EASY to find on the internet nowadays.
145039
The best project will be one that has some interest to the 5th grader. So my granddaughter likes animals. But my youngest boy likes photography. So a pinhole camera would bore my granddaughter but would have caught the interest of my son.\n\nThat being said... Here's an easy one. Go to a store and find some cheap analog clocks (clocks with hands) that run on a single AA battery. Then go to Radio Shack and get some battery holders and some "aligator clip leads" -- short wires with clips on either side. And get a bunch of different brand batteries of different sizes (if you are trying to get by simply, use only AA batteries and then you just need the clocks and the batteries).\n\nTake off the battery covers and hook up the battery holders to the clocks with the clipleads (unless you are only using AA batteries). Then put batteries in and see how long it takes for the clocks to run down. This may take a long time. If you are short on time, try this. Get a flashlight bulb at radio shack and put it across the battery with the clock. So this way the battery is running the clock and the flashlight bulb at the same time. Note the time on the the clock and check it every day to see when the clock stops. You can graph the results easily.\n\nQuestions:\nWhat lasts longer, a AA, a C, or a D battery?\nWhat brand of battery lasts longer?\nWhat lasts longer, a standard carbon-zinc battery or an alkaline battery? What is the cost difference per unit? Per run time?\n\nA little research on the internet about how batteries are built, and the different technologies (carbon-zinc, alkaline, nicad, NiMh, lithium, lead-acid) and you have a great project.
232279
There are lots of battery technonlogies. The common battery is made of carbon and zinc with an electrolyte that is primarily manganese. But other batteries use nickle/cadmium, nickle/metal hydride, mercury, lead/acid, and lithium compounds. So depends on what battery you are talking about.
1116545
See sources for making a "lemon battery" or a "potato battery".  You'll probably need to hook several of these batteries together in parallel in order to get enough current to power an LCD, but it should be possible.  Alternatively, you can use pieces of copper and zinc sheet metal to increase the surface areas of the electrodes in each battery, which will increase the current produced by each battery.
906964
Here's a tip, leave the baking soda and something a bit complicated.  Like a Lemon battery. I have a site that has choc loads of interesting things.  Most of all very simple.
553159
Take the battery down to Radio Shack.
41764
you can find a very good tutorial at the link.\n\nNo need to write whats already writtenm =)
250746
This is the best answer you'll get -\nhttp://electronics.howstuffworks.com/battery.html
821830
You have to know with what kind of battery your starting.
431240
oh this has been awhile....ok a block of wood, a couple nails, some tape, some wire, and a six? volt battery.\n\nyou are basicaly making one of the nails an electro magnet so that when the circuit is completed it comes on and pulls down one of the wires to the top of it making a clicking noise, open the circuit the wire will spring back up.  \n\nhere is a more complicated one that will send to another one\nhttp://www.apluschilddev.com/headstart/services/projects/easy_make_telegraph.htm