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12v lithium battery pack with lithium battery protection board protection, a good and bad battery not only depends on the quality of batteries how, I do not know the impact of the protective plate on the battery is also great. Poor quality protection board not only can not play a protective role on the battery, there may be the culprit to create accidents. So we have to master the basic protection board and the detection of batteries.
Common protection board bad reasons are:
  1. No charge current.
  2. No discharge output.
  3. The batteries are not protected.
  4. Instantaneous discharge protection.

  To charge the battery charge line to see the charge current readings, 50mA-600mA is generally normal between the phenomenon. If the current below 50mA, with tweezers to clamp the battery B-and battery protection board p-pole a few seconds to see whether the ammeter index rose, let go and locked between 100mA-600mA, if this happens then You can determine the battery power, as long as the charge on it.

  If the ammeter indicates more than 600mA or more than 1A, you can determine the battery is bad. Determine whether the battery is fully charged, you can first discharge or use the table to measure the battery power will be more than 4.1V. Generally there is no discharge current of the machine are bad protection board.

  Charge state, the voltage in the 3.0V-4.1V, the current in the 50mA-600mA for the normal, but pay attention to the positive and negative can not be reversed. In the discharge state, there is a protective plate voltage above 3.2V, the current above 200mA is normal. Discharge state, not through the protection board voltage between 2.0V ~ 3.2V, the current above 100mA as normal.

  In the discharge state, if the battery voltage is above 3.7V, there is no voltage and current in the moment is the protection board is bad. Test switch on the switch is, hit the test "charge", hit the test "discharge" function.

  The above is the basic lithium battery protection board and cell detection method, you can check the protection board is bad.