About this replacement
Bissell 3175+ Series — 25.2V Li-ion Replacement Battery (1626397)
This 25.2V 3000mAh Li-ion battery replaces part number 1626397 in the Bissell 3175+, 3177+, 3177A, 3178+, and related cordless vacuum models. It slots directly into the battery bay and communicates with the vacuum's onboard BMS using the same handshake as the original cell pack. Capacity is 3000mAh (75.6Wh), matching the stock specification.
- 3175+ and 3177 series compatibility: These models share the same 25.2V battery rail, connector pinout, and BMS communication protocol — which is why a single cell pack covers the entire line. Swapping between models in this group does not require firmware changes or charger adjustments.
- Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a 3175+ unit and confirmed the BMS negotiated charge termination correctly, the suction motor reached full rated speed, and the low-battery cutoff triggered at the expected voltage threshold without premature shutdown.
- Dock charging behaviour on the 3175+ series: Remove the vacuum from the charging dock once the indicator shows full. The 3175+ dock does not automatically stop trickle current when the cell reaches capacity, and leaving it docked continuously accelerates capacity loss in Li-ion cells far faster than normal cycle use.
Suction dropping before the battery indicator reaches low on the 3175+
The 3175+ motor draws significantly more current when the filter is partially blocked or the dustbin is full, because the motor works harder to pull air through restricted pathways. That elevated current draw causes voltage to sag at the cell pack earlier in the discharge curve — the indicator still reads mid-range, but the pack is already under stress. The BMS responds by pulling back power to the motor to protect the cells, which the user experiences as a sudden drop in suction. Clean the filter and empty the bin first; if suction restores immediately, the battery is not at fault.
Motor cuts out mid-clean then recovers after a short pause
This is a BMS overcurrent trip, not a faulty battery. When suction is restricted — blocked nozzle, clogged filter, or dense carpet forcing sustained high draw — current spikes past the BMS protection threshold and the pack disconnects the motor. Releasing the trigger for 10–15 seconds allows the BMS to reset and the motor restarts. Fix the restriction causing the sustained high draw; if it trips repeatedly on a clean filter and clear nozzle, verify the pack voltage at rest reads above 22V before ruling out cell degradation.