Generally, there will be \"\" and\" - \"signs next to the contacts of the mobile phone battery, and you only need to contact the two contacts of the universal charge respectively with the\" \"and\" - \"of the battery. After the connection, the indicator light of the universal charger will light up. In addition to the positive and negative electrodes of the four contact mobile phone battery, the other two are generally speaking, respectively, battery model detection and temperature detection, temperature detection is a thermistor, battery model detection many mobile phone batteries are actually a resistor, the mobile phone according to different resistance values to distinguish the battery model, corresponding to different charging procedures, There are also batteries with chips in them to read the code to determine the battery model and whether it is an original battery.
In the past, most of the mobile phone batteries with three contacts moved the temperature detection resistance to the mobile phone PCB, and the third contact was still the battery model detection, not the temperature interface.
Therefore, whether it is a three-contact battery or a four-contact battery, or even a battery with more contacts, in fact, only the positive and negative electrodes are used to charge when charging, and the rest can be seen as an auxiliary role.
6 holes of the battery universal charger to 6 contact points of the battery charge, the universal charger only positive and negative two points, the battery to see positive and negative are two, can only be tested by the multimeter that there is electricity, if there is no multimeter, can only use the universal charger, no plug in before, one by one test, with the universal charger to prove that you can charge.