Cecotec Rockstar 300 Replacement Battery 25.9V 2500mAh

Cecotec Rockstar 300 / 500 Series — 25.9V Li-ion Replacement Battery (60076)

This 25.9V 2500mAh Li-ion battery replaces part number 60076 in the Cecotec Rockstar 300, Rockstar 300X, Rockstar 500, and Rockstar 500X cordless stick vacuums, along with twelve additional models in the same family. It slots into the same battery bay and connects through the same BMS handshake as the factory cell. Capacity is 2500mAh (64.75Wh) — matched to the original specification.

• Rockstar 300 and 500 platform fit: The 300 and 500 series share the same 25.9V seven-cell battery architecture and identical connector pinout. One cell covers the full range because the motor controller draws from the same voltage rail across all models in this lineup.
• Bench tested on actual hardware: We cycled this cell through sustained suction loads on a Rockstar 500 unit. The BMS held steady through full carpet-mode draw, tripped correctly at undervoltage, and recovered cleanly after a rest period with no faults logged.
• Dock charging habit for this vacuum: Do not leave the Rockstar on the charging dock permanently. These vacuums trickle-charge when left docked after full charge, and that sustained low-current charge accelerates capacity fade in Li-ion cells. Charge to full, then remove it from the dock.

Cordless vacuum losing suction before the battery indicator reaches low

This is almost always voltage sag under load, not a low state of charge. When a partially blocked filter forces the motor to draw above its rated current, the battery voltage drops sharply mid-cycle — enough for the motor controller to reduce power — even though the indicator still reads mid-range. The fix is not a new battery. Pull the filter, wash it if washable, and let it dry fully before reassembly. A clean filter normalises motor draw and the voltage sag disappears.

Motor cuts out mid-clean and then recovers after a short pause

This pattern is a BMS overcurrent trip, not a dying battery. Sustained restricted airflow — blocked filter, full dust cup, or a blockage in the wand — forces the motor to pull more current than the BMS allows. The BMS cuts the output to protect the cells, then resets after a cooldown. Check the filter and empty the dust cup first. If the cutout stops after clearing the restriction, the battery and BMS are functioning exactly as intended.