How to Use a Multimeter to Test Lithium Battery Quality

Use a multimeter to measure the voltage of your cell phone battery. Touch the red test lead to the DC 10V level at the + pole of the battery and the black test lead to the - pole to read the battery voltage. Generally, the battery voltage of mobile phones is 3.7V. Under normal circumstances, a good battery will be 0.3-0.5V higher after being fully charged. Generally, cell phone batteries are equipped with overcurrent protection and low voltage protection circuits. When the battery output current is higher than the battery rated current, the circuit will automatically disconnect the circuit to protect the battery and prevent it from exploding due to rapid heating due to battery short circuit . Use a multimeter at DC 10A level to. test whether the battery protection circuit is effective. The method consists of addingster the multimeter to DC 10A level and connect the red test lead to the + pole of the battery, connect the black test lead to the - pole of the battery and pay attention to the response of the multimeter reading. If a reading flashes and then immediately returns to 0, this is normal. I hope this answer is helpful to you