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The current from a battery is always constant because the voltage provided by the battery remains steady, which results in a consistent flow of electrons through the circuit.

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3mo ago

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Why would a battery discharge for no apparent reason?

Either something is on and is drawing current from the battery or the battery itself has a dead cell which will drain the battery. If the battery is over 3 yeas old, replace it.


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Without knowing the maximum output current it was designed to produce it isn't possible to say exactly how much voltage a charger produces. Also, was it intended to give a slow or a fast charge? In general all that can be said is that the output voltage of a battery charger must always be slightly higher than the nominal voltage of the battery it was designed to charge. This is for the simple reason that it won't be able to put any charge into the battery unless the charger's "on-load" voltage is higher than the battery's voltage. For the same reason, a charger which can deliver a high output current (amps) will need a higher "on-load" output voltage than a charger which can only deliver a low current. Also, when it is switched on but is not connected to a battery, the output voltage of any charger will always be higher than when it is doing its job of charging a battery. That voltage is called the "no-load" voltage. Assuming the battery being charged is a standard low-voltage type, of less than, say, 24 volts DC, it is quite safe, using a standard electrician's voltmeter, to measure the load and no-load voltages of the charger as described above.


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A diode is a semiconductor device that allows current to flow in only one direction. Although there may be several reasons why there is a diode on a calculator PC board, a common reason would be to protect the device from a battery inserted in the wrong direction (if battery powered) or if an AC adapter is used, to make AC into DC current.


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The battery has a temperature sensor. If it was left unplugged, the battery light will still be on


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