Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to charge a power bank [title] Check the led lights to see when your power bank needs charging. [step] While a power bank can be charged at any time, unnecessary charging may decrease its lifespan. Most power banks have 4 led lights on the side.

Ending1: If a turn turns out to be green, the power bank might have disabled the battery. [title] Determine what kind of lights to charge. Ending2: When your power is charging, after you turn on the lights, the led lights appear once or twice. [substeps] If your power bank has only 4 led lights, you can try charging batteries with matching led bulbs. Ending3: The lights are needed to charge your power system regularly. Apply the led light when it turns off and you can charge it more readily. Ending4: The lights will shut off as the battery diminishes. Wait to charge your power bank until only 1 or 2 lights are on.

Answer format: ending1/ending2/ending3/ending4