1. Choose battery products with the "_____" mark. 2. Select the appropriate battery type and size according to the requirements of the appliance. 3. Pay attention to check the production date and expiration date of the battery. 4. The battery mark should indicate the manufacturer's name, battery polarity, battery model, etc. on the battery trademark. 5. To protect the environment, opt for batteries labeled "no mercury," "0% mercury," or "no added mercury." Aviation ground power 2, 36V aviation power 1, 400HZ variable frequency power supply 7, 115/200V power supply 2, 27V DC power supply 5, 400HZ power supply 12, aviation power
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