After reaching 500 complete charge cycles (some lithium batteries may reach 300 cycles, which may be shortened by irregular use), their lifespan will come to an end. When this happens, the performance and safety of the lithium batteries will be reduced.

We suggest that you replace the battery or contact the Anker’s customer service if the following issue occurs:

1. Swelling of the battery case.

2. Liquid or obvious odor appears on the USB interface.

3. Abnormal heat occurs during use.

4. When shaking the battery, there is a sound from internal electronic components.

5. Cracked case.

6. Liquid has entered through the USB port.

If you have any other questions, please feel free to contact us for help.