- 1). Open the battery housing panel for your aircraft. Batteries are housed in different locations as designed by different aircraft makers. Disconnect the cable connections to the battery and attach the battery charge reader.
- 2). Take down the readings you read for current, voltage and amperage. The battery tester has a gauge with striations for the three criteria. The tester has two, spring-clamp jaws that attach to the battery terminals.
- 3). Open the aircraft guidelines and operating manual - a document that must be in the aircraft at all times, per FAA regulations - and look up the battery specifications.
- 4). Cross reference the readings from the tester and the specified requirements for the aircraft battery. Discard the battery and replace if it is not operating according the recommended guidelines.
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