About this replacement
Rowenta RH8827WO/2D0 Series — 25.2V Li-ion Replacement Battery (RS-RH5274)
This is a 25.2V 3500mAh lithium-ion battery pack for the Rowenta RH8827WO/2D0 and related cordless stick vacuum models. It replaces OEM parts RS-RH5274, RS-2230001828, and RS-2230001688. The pack slots into the same bay as the original and connects to the same motor drive circuit.
- RH8827 and RH8828 series compatibility: These models share the same 25.2V motor rail, battery bay dimensions, and BMS handshake protocol. The connector pinout and cell group count are identical across the RH8827WO/2D0, RH8827WO/2D2, RH8828, and RH8828WO/2D0, which is why one pack covers the full range.
- Bench tested on actual hardware: We cycled this pack through full charge and discharge on the RH8828 platform. The BMS held voltage above the 21V low-cutoff threshold through the full discharge cycle and tripped correctly on overcurrent when we simulated a blocked filter condition.
- Dock charging habit on cordless stick vacuums: Do not leave this vacuum sitting on the dock permanently between uses. Continuous trickle charging accelerates capacity fade on lithium cells in this voltage class. Charge to full, then remove from the dock until the next use.
Cordless vacuum losing suction before the battery indicator reaches low
This happens when the motor draws more current than the BMS expects — usually because the filter is partially blocked. A restricted filter forces the motor to work harder, pulling sustained current above the rated draw. The BMS reads this as a voltage sag event and reduces output to protect the cells, even though the battery is not empty. Clean or replace the filter first, then retest. If suction recovers immediately, the battery was not the cause.
Motor cutting out mid-clean then recovering after a few seconds
This is a BMS overcurrent trip, not a dead battery. When suction is restricted — blocked nozzle, clogged filter, or heavy carpet fibre buildup — the motor draws a sustained spike above the pack's current limit. The BMS cuts the circuit to protect the cells, then resets after a short thermal or timer cooldown. Clear the blockage and check that the filter is seated correctly. If the cutout persists on a clean filter and open nozzle, measure pack voltage at rest — it should read between 24V and 25.2V on a full charge.