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Button Battery Repair

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					Button Battery Repair

Many small gadgets are powered by miniature batteries, often called button batteries because
they are as small as a shirt button. They power watches, calculators, toys, palm computers,
electronic notebooks, computer clocks, some cell phones, and many other household items.
They are everywhere. Lucky for us, they are easy to check and replace.

How Does It Work?

A battery stores and delivers electric current. All batteries contain two electrodes and an
electrolyte, which produces the chemical reaction with the electrodes resulting in a current. In
"dry" batteries, the electrolyte is a paste of powdered chemicals. A battery's voltage depends
on the metals that are used in its electrodes and the number
of cells.

A button battery contains powdered zinc and mercury oxide
with an alkaline electrolyte. The zinc loses electrons as it
becomes zinc oxide, while the mercury atoms gain electrons
as the mercury oxide changes to mercury. Button batteries
typically produce 1.35 volts. One side of the battery is
marked with a [+], the positive side, and the other is the
negative side. Button batteries are round, but come in
various heights and widths.                                       Remove the button battery
                                                                  from the device and read the
What Can Go Wrong?                                                front to determine what the
                                                                  voltage should be; in this
Like other consumer batteries, they either work or they           example it is 3V.
don't. They aren't rechargeable, so fixing one means
replacing it. In addition, button batteries can corrode, losing their electrical connection. In
extreme cases they can leak, damaging adjacent components.

				
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posted:10/28/2011
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