What's the best way to storage lithium polymer battery cell?

Proper Storage Guidelines:

1. Core Rule – Optimal Storage Charge Level

Never store fully charged (100%) or completely drained batteries.✅ Ideal long-term storage charge: 40%–60%.Principle: A full high-voltage charge accelerates electrolyte aging; severe low power causes over-discharge lockup, leading to permanent battery failure.

2. Temperature & Environment (Most Critical)

✅ Store in a cool, dry, dark place at room temperature: 10°C–25°C.❌ Avoid: direct sunlight, enclosed cars, heat sources, or humid, moldy areas.❌ Avoid long-term storage in extreme freezing cold (capacity loss & lithium plating hazards).

High heat is the biggest enemy of lithium-ion batteries and drastically speeds up degradation.

3. Pre-Storage Preparation

Adjust battery charge to around 50%.

Power off the device completely (phones, tablets, cameras).

Unplug all chargers and external accessories.

Place in a moisture-proof bag or sealed container to block dust and humidity.

4. Maintenance for Long-Term Storage (over 1 month)

Check the battery level every 1–3 months.

Recharge to roughly 50% once the level drops below 30%.

Perform one mild charge-discharge cycle yearly (discharge to 30% → recharge to 70%) to activate battery activity.

5. Strictly Forbidden Practices

❌ Long-term storage at 100% charge (causes swelling & severe lifespan reduction).❌ Long-term storage at 0% charge (irreparable over-discharge damage).❌ Short circuits or direct metal contact with battery terminals.❌ Squeezing, puncturing, or heavy compression (fire & explosion risks).