How to detect mobile phone battery is good or bad?
General cell phone battery voltage is 3.7V, under normal circumstances the battery is fully charged after the high 0.3-0.5V, the general mobile phone battery with overcurrent protection and low voltage protection circuit, when the battery output current is greater than the rated current of the battery The circuit will automatically disconnect the circuit to protect the battery, to prevent short-circuit caused by the battery caused by excessive explosion.
With a multimeter DC 10A file can be measured whether the battery protection circuit is valid, the method is to switch to DC 10A file, red pen then battery + pole, black pen to the battery - pole, pay attention to observe the multimeter reading reaction, flashed a reading immediately Back to 0 for normal.
With a multimeter to measure the battery voltage with a DC 10V file red pen touch the battery + pole, black pen touch the battery - you can read the battery voltage.
