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This is a really simple little trick. Its more common sense than anything but it might be useful for someone :)

It's basically for when you need to run a device but don't have enough batteries and can't be arsed to goto the shop to buy some.

So for this example I'm using my electric shaver but a more practical or likely example would be a battery radio.

Step 1: Get a Metal Object

Get a metal object, ideally something like a large pair of nail clippers is best since you simply open them up and squeeze them between the battery points where you have a missing battery. It's that simple, the device will now run off just the one battery and you can sit back drinking beer rather than going to the shops.
this will not work for anything with a low voltage shut-off circut, like camras and most other things
good instructable<br/>=D<br/>btw, i have that same electric shaver<br/>lol<br/>
Awsome! that would make sense if you think about it.
actually schorhr when you use 2 battery's you don't add the two voltages together the voltage stays the same but you add the amps and usually a device wont have a problem with a little less amps and will only shorten the life of the battery
actually, if the batteries are in paralel you're right but quite often (like in radios) they are placed in series and they do add up the voltage so if the batts are in paralel this works perfectly, otherwise, not
It depends how you connect the batteries together, and to the load. Batteries in parallel (side by side and with the anodes all connected together) will have the same voltage, no matter how many you connect. But with each added battery, the current (amps) will increase. Batteries connected in series (anode to cathode over and over) will have an increase in voltage with each battery added. However, the increased resistance due to the batteries themselves will actually begin to lower the current.
Hello, this will work with few devices, especialy not with devices that require a certain minimum voltage. While analog devices such as flashlights, motor powered things etc. will just not work as bright/fast, most electronics will not work properly due to the low voltage- unless they have a stepup circuit with a broad tollerance. However, its possible to use different sizes of batteries by connecting the smaller ones, since they have the same voltage- only big capacity-differences (such as a AAA micro and a bigger cell) can lead to a damaged battery!

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