Battery indicator flashes B1, and the vacuum will not start.

Safety: Stop using any non-original charger immediately. Do not use or charge a battery that is hot, swollen, or leaking.

• Allow to rest: Remove the battery from the charger and let it sit at room temperature for at least 1 hour.
• Use original charger: Recharge only with the correct Parkside charger model. Observe the charger LEDs for normal behavior.
• Test on another tool: If you have another Parkside cordless tool compatible with the same battery, test the pack there. If it also shows an error, the battery is faulty.
• Replace charger: If multiple batteries show B1 only after using a specific charger, replace that charger.
• Do not open pack: If B1 persists, replace the battery pack; internal BMS or cells may be damaged.