Before Your Lithium-Ion Battery Goes Into Storage: To Charge or Not to Charge?

In the past, batteries needed to be fully charged before long-term storage to prevent damage from self-discharge. Older technologies like nickel-cadmium (NiCd) or lead-acid batteries required this to avoid permanent capacity loss.

Modern lithium-ion batteries are different. They experience negligible self-discharge and include built-in safety electronics. These integrated fuses can automatically switch a highly discharged battery into a rest state, protecting it against damage.

For the longest lifespan, STIHL recommends storing lithium-ion batteries at 40–60% charge — this is shown by two green LEDs. Avoid storing fully charged or completely empty batteries.

Older battery types such as NiCd or lead-acid suffered from high self-discharge. If left unused for long periods, their charge could drop below the cut-off voltage, leading to over-discharge and possible failure to recharge.

This is why older advice recommended full charging before storage — but this is no longer necessary for modern lithium-ion batteries.

STIHL lithium-ion batteries feature intelligent Battery Management Systems (BMS) that monitor cell voltage and prevent over-discharge. When voltage drops too low, the BMS automatically switches the battery into rest mode to stop further energy loss.

With self-discharge rates as low as 1–3% per year, you can safely store STIHL batteries without worrying about degradation.

Tools like the STIHL FSA 45 cordless trimmer feature integrated, non-removable batteries. To prepare these tools for storage:

• Switch off the power tool and remove the activation key.
• Clean dirt or debris from the tool with a damp cloth.
• Store in a dry, frost-free location away from direct sunlight.
• Keep the activation key stored separately for safety.

After long-term storage, charge the battery just before using it again. This helps maintain full capacity and extends the overall service life.

The battery will only charge above 5°C — STIHL chargers automatically delay charging if the temperature is too low or too high.

• Remove detachable batteries from tools before storage.
• Check charge level — store at 40–60% (two green LEDs).
• Clean batteries with a damp cloth if dirty.
• Store in a dry, shaded area such as a garage or shed.
• Maintain storage temperatures between -10°C and 50°C.
• Keep batteries out of reach of children.
• Store chargers separately between 5°C and 40°C.

Always store your STIHL lithium-ion batteries at 40–60% charge — typically shown as two lit LEDs. This balance minimises both ageing and self-discharge.

At this charge level, batteries can safely remain unused for up to two years without damage. Only charge the battery before its next use, and always above 5°C.

• Do not store lithium-ion batteries fully charged or empty.
• Ideal storage charge: 40–60% (two LEDs).
• Store between -10°C and 50°C in a dry, frost-free place.
• Extremely low self-discharge ensures long life even during storage.
• Check your tool’s manual for model-specific temperature guidance.