About this replacement
DeLonghi Colombina XLR24LI Series — 25.9V Li-ion Replacement Battery (Colombina 5519210401)
This is a 25.9V Li-ion battery pack rated at 2500mAh (64.75Wh), built to replace the original Colombina 5519210401 in the DeLonghi Colombina XLR24LI and XLR24LI.BL cordless stick vacuums. It fits the same battery bay and uses the same connector orientation as the factory pack. Cell count and voltage match the original power path exactly.
- XLR24LI and XLR24LI.BL compatibility: Both models run the same 25.9V seven-cell Li-ion architecture and share the same BMS handshake protocol. One battery pack covers both variants — no wiring or adapter changes needed.
- Bench tested on actual hardware: We ran this pack through the Colombina motor controller under simulated load. The BMS held the voltage rail steady through the motor start draw and cut off cleanly at the low-voltage threshold without tripping mid-cycle.
- Dock charging behaviour on the Colombina: The Colombina charging dock does not cut power once the pack reaches full charge. Remove the vacuum from the dock when the charge is complete — continuous dock charging accelerates cell degradation on this platform faster than most cordless vacuums.
Suction dropping before the battery indicator reaches low on the Colombina XLR24LI
This happens when the motor draws more current than rated due to a blocked filter or partial blockage in the airpath. The BMS reads an overcurrent condition and reduces output voltage to protect the cells — the motor slows, suction drops, but the battery indicator still shows charge remaining. The indicator reflects cell voltage, not available current. Clear the filter first, then retest — if suction holds, the battery is not the cause.
Motor cuts out mid-clean and then recovers after a few seconds
This is a BMS overcurrent trip, not a dead battery. When sustained suction restriction forces the motor to draw above the BMS current limit, the pack shuts output off momentarily to protect the cells. Recovery after a few seconds confirms the BMS reset — the pack itself is functioning correctly. Check the filter and brush roll for blockages before concluding the battery is faulty. A clear airpath keeps draw within the 25.9V pack's rated current envelope.