How to correctly identify the positive and negative electrodes of battery

There are several simple methods that correctly identify the old battery positive and negative electrodes. It can be used by everyone for fast judgment when charged or testing.

1. According to characteristics of battery electrode design judgment

When battery usually used in the production design, Its battery pile is thicker at one end of the positive electrode. At the other end are some of the negative electrode, can identify the color of the storage battery pile at the same time, the positive electrode pile appears dark brown, while negative electrode appears as dark gray. Other battery positive and negative markers in English letters, is expressed as the positive electrode, P N as the negative electrode, it can never make a mistake when repair charge.

2. Use a multimeter voltage measurement

Multimeter can be allocated to the dc gear, two pens and jumper on the battery two electrodes respectively, and then if the battery shows normal voltage value, then prove that the red pens and touch the electric battery positive electrode. While black pens and place for the negative electrode. Sometimes measured no normal battery voltage, can measure the battery of weak electricity to judge. After two pens and electromagnetic bottles of electrode, if the clock shakes slightly to the right, it proves that the red pen for the battery positive electrode. Black pens and negative electrode. But if the multimeter pointer left shaking whose hands against (to play), is proved by red pen touch for battery negative electrode.

3. The wire short circuit for identification

Will each of the two copper core power line jumper at the old battery electrodes to measure, then the normal configuration good electrolyte (strong brine) into a glass cup, insert the power cord ends respectively inside the cup, and put on both sides of the glass edge (two lines in the cup can't touching one another), and then observe their pins bubbling in the electrolyte, if a pan of vesicles on the wire and terminal bubbles and more obviously. Then connect the battery negative electrode, at the end of the bubble on the pan without obvious side is less battery positive electrode.

4. Use of determination of rectifier diode

In the power supply voltage regulator rectifier diode with unidirectional conductivity can find a rectifier diode. A flow of light-emitting diodes (leds) only. Then, in turn, according to a pile of battery - diode + end to diode - end - led + and - > battery connected, another pile order form a series circuit of an electric lamp, at this time if the loop was lit the lamp light, is extreme and battery pile junction diode is the battery positive electrode, the other end of the battery negative electrode.

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