Cecotec Conga Rockstar 29600 Replacement Battery T-DC49L 28.8V

Cecotec Conga Rockstar 29600 — 28.8V Li-ion Replacement Battery (T-DC49L)

This is a 28.8V 2500mAh (72Wh) lithium-ion battery carrying OEM part number T-DC49L. It fits the Cecotec Conga Rockstar 29600, Rockstar 6500 Century Ergowet robotic vacuum cleaners. Swap it in when the original cell no longer holds enough charge to complete a cleaning cycle.

• Conga Rockstar 29600 and 6500 Century Ergowet compatibility: Both models run the same 28.8V battery rail and share the T-DC49L connector and BMS handshake profile, so one cell covers the full platform without any wiring changes.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Conga Rockstar platform. The BMS communicated correctly with the dock charger, current limits held within spec, and the protection circuit responded to overcurrent conditions as expected.
• Dock charging habit for this robot: Do not leave the Conga on its charging dock permanently between sessions. Continuous trickle charging accelerates capacity fade on these cells. Charge to full, then remove the robot from the dock until the next cleaning run.

Suction dropping before the battery indicator reaches low on the Conga Rockstar

The Conga Rockstar's motor draws significantly more current when the filter is partially blocked or the brush roll is restricted. That elevated draw causes voltage to sag on a weakened cell before the indicator circuit registers low battery. The robot loses suction performance while the display still shows adequate charge. Clean the filter and check the brush roll before concluding the battery is the fault — if suction restores after cleaning, the cell was not the issue.

Motor cutting out mid-cycle and recovering a few seconds later

This is a BMS overcurrent trip, not a dead battery. When the Conga's suction path is restricted — blocked filter, tangled brush roll, or a tight carpet pile — motor current spikes above the BMS protection threshold and the circuit opens to protect the cell. The BMS resets after a few seconds and the motor restarts. Clear the restriction first. If trips continue on a clean filter and unobstructed brush roll, measure resting cell voltage; a healthy 28.8V pack should read at least 29V fully charged.