All batteries do the same thing: They produce an electric current to do some kind of work. But energy isn't free. If that work is blasting music on your Bluetooth speakers, there has to be something that decreases in energy. In a good old AA, there's a chemical reaction to produce the current. That chemical reaction doesn't last forever, so the battery will eventually die.
So it would probably be safe to use. Could It Last 50 years? All right, let's talk about electricity. First, we need some basic terms. An electrical current is just a flow of electrons in a circuit. The rate of flow is measured in amperes: 1 amp=6.24 x 1018 electrons flowing through a certain point per second. Got that? OK, the power supplied , measured in watts, can be calculated by multiplying the electrical current by the voltage . One watt equals 1 joule of energy per second.
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