There is no specific expiration date for the battery; however, after approximately 500 charge-and-discharge cycles, the battery will typically retain about 60–80% of its original capacity.

Like all lithium batteries, these batteries also experience calendar aging, which is the gradual chemical degradation that occurs over time, even when the battery is not in use. During long periods of inactivity, the battery will slowly self-discharge (typically around 1–3% per month). If the voltage drops too low—generally below approximately 2.5–3.0V per cell—it can cause permanent damage and may prevent the battery from holding a charge properly.

Lithium batteries generally perform best and last longest when used regularly, even with light use, rather than being stored unused for extended periods.

For best results during long-term storage or periods of non-use, we recommend the following:

• Store at a partial charge: Keep the battery between 40–60% charged. Avoid storing it fully charged or fully discharged, as both extremes can accelerate battery degradation.
• Store in a cool environment: Ideal storage temperature is approximately 15–25°C (59–77°F). Avoid high heat (such as cars, attics, or near heaters) and freezing temperatures, as temperature extremes significantly increase battery aging.
• Check and recharge periodically: Every 2–4 months, check the battery level and recharge it to the 40–60% range if needed. This helps prevent the battery voltage from dropping too low and preserves long-term battery health.