Conga Rockstar 6500 Replacement Battery 28.8V 2500mAh

Conga Rockstar 6500 Century Ergowet — 28.8V Li-ion Replacement Battery

This is a 28.8V, 2500mAh (72Wh) lithium-ion battery pack for the Conga Rockstar 6500 Century Ergowet and Rockstar 29600 robotic vacuum. It slots into the same bay as the original and works with the stock charging dock. Capacity comes from the product specification — not estimated from web sources.

• Rockstar 6500 and 29600 platform: These models share the same 28.8V cell architecture, dock connector, and BMS communication protocol. One battery fits both without adapter or modification.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on the Rockstar 6500 platform. The BMS negotiated correctly with the dock charger, and overcurrent protection tripped as expected when suction was deliberately restricted at the nozzle.
• Dock charging behaviour on this vacuum: Do not leave the Rockstar 6500 sitting on its dock permanently. The dock does not stop delivering charge once the battery is full — continuous trickle current accelerates cell degradation. Charge to full, then remove the robot from the dock until the next scheduled clean.

Suction dropping before the battery indicator reaches low

The Rockstar 6500's motor draws significantly more current when the filter is partially blocked or the brush roll is tangled. That extra draw pulls cell voltage down faster than normal, and the BMS reads the sag as a low-charge condition before the actual state of charge warrants it. The vacuum then reduces motor speed to protect the cells — which the user experiences as lost suction. Clean the filter and clear the brush roll first. If suction holds steady after that, the battery was not the cause.

Robot cuts out mid-clean and restarts on its own

This is a BMS overcurrent trip, not a battery failure. When the Rockstar 6500 encounters a blocked nozzle or dense carpet, motor current spikes above the BMS threshold and the pack shuts off to protect the cells. The BMS resets after a short thermal delay, which is why the robot recovers and continues. Check the intake port and side brushes for debris. If the cutout happens only on carpet and not on hard floors, the issue is suction restriction — not cell capacity.