Laptop battery test with current amp measuring ammeter

Go straight to the procedure

Go straight to battery’s capacity calculation

Go straight to simple battery functionality test


When the laptop’s battery doesn’t work as expected, there are ways to test it, without buying a new battery and later finding out, the problem lay in the laptop’s battery charging circuit. There are a few possible scenarios – battery’s capacity could simply drop below the designed rate over time, battery protection circuit could be activated, the laptop’s charging circuit could be faulty, communication paths between the laptop and battery could be open, charging power adapter could be faulty or not supplying enough current to charge the battery or a signal pin on power supply adapter could be broken and thus not properly identifying itself to the laptop.

Tools required:
  • GetGui DC charging adapter with ammeter
  • A charger tip, compatible with the brand and model of the particular laptop. It could be acquired via Ebay if it wasn’t supplied together with the GetGui charging adapter.


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