How to Store a Power Bank When Not Used for a Long Time? Tips on Charge Level, Temperature, and Environment

Power banks have become indispensable gadgets to keep our devices charged on the go. However, when a power bank is not used for a long time, improper storage can lead to battery degradation or even permanent damage. Knowing how to store a power bank well can significantly extend its lifespan. This blog covers the key considerations regarding charge level, temperature, and environment for long-term storage.

Charge Level: The Sweet Spot

Always store a power bank with its charge level between about 40% and 60%. Storing it fully charged (close to 100%) causes continuous stress on the lithium-ion battery, accelerating capacity loss. Conversely, leaving the battery completely empty risks deep discharge, which may cause permanent damage and make it unable to recharge. Keeping the battery around 40-50% charged is widely considered the best practice to minimize stress and slow natural self-discharge over time. It’s recommended to check the charge every 3-6 months and recharge to that level if needed.12

Temperature Matters

Temperature plays a crucial role in battery health. The ideal storage temperature is generally between 20°C and 28°C (68°F to 82°F). Extreme heat accelerates battery aging and can cause safety issues, while very cold temperatures temporarily reduce performance and may increase internal resistance. Power banks should never be stored in direct sunlight, hot attics, or freezing garages. Keeping a power bank in a cool, dry place with stable temperature supports longevity.34

Environment and Location

Besides temperature, the environment should be dry and well-ventilated. Avoid moisture, high humidity, and exposure to dust or contaminants, which can damage the battery and circuits. Indoor storage locations like drawers or closets are ideal, provided they are away from heat sources and sunlight. Also, avoid leaving power banks inside cars for extended periods, as temperatures inside vehicles can fluctuate drastically and damage the battery.

Maintenance Tips for Long-Term Storage

• Charge the power bank to about 40-60% before storing.
• Store in a cool, dry, and ventilated place away from direct sunlight.
• Avoid full charge or complete discharge during storage.
• Inspect the charge level every few months and recharge if below 40%.
• Do not store in extreme temperature environments.
• Use the original charger or a reputable brand for charging.

Following these guidelines helps prevent battery swelling, capacity loss, and potential safety risks. A well-maintained power bank can last significantly longer and remain reliable when needed.

In conclusion, proper storage of a power bank when not in use for a long time requires careful attention to charge level, temperature, and environment. Keeping the battery partially charged, avoiding extremes in temperature, and storing in a dry, ventilated place are the best practices to maximize longevity.