Haier JX37 Sweeper Replacement Battery 14.4V 2600mAh

Haier JX37 Sweeper — 14.4V Li-ion Replacement Battery (MH1-4S1P-SC)

This is a 14.4V 2600mAh Li-ion replacement battery for the Haier JX37 cordless stick vacuum. It uses OEM part number MH1-4S1P-SC and slots directly into the JX37 Sweeper battery compartment. Capacity is 2600mAh (37.44Wh), matching the original cell specification.

• JX37 Sweeper platform fit: The JX37 runs a 4-cell series Li-ion pack at 14.4V nominal. The MH1-4S1P-SC configuration matches that cell count and the BMS handshake the JX37 motor controller expects on power-up. Swapping to a mismatched cell count trips a protection fault and the vacuum will not run.
• Bench tested on actual hardware: We cycled this pack under a simulated floor-cleaning load, varying draw between low-pile and high-pile carpet resistance profiles. The BMS held cell balance across all four cells and cut off cleanly at the low-voltage threshold without nuisance trips.
• Dock charging habit on the JX37: Do not leave the JX37 sitting on its charging dock between uses. Continuous trickle charging on a full pack accelerates capacity fade in Li-ion cells. Charge to full, then remove the vacuum from the dock until the next use.

Suction dropping before the battery indicator reaches low on the JX37

This happens when motor draw spikes — usually from a partially blocked filter or a restricted brush roll — and voltage sags across the pack before the indicator registers a low state. The BMS reads cell voltage under load, not at rest, so a worn or dirty filter forces the motor to pull harder than rated current, dragging cell voltage down fast. Clean the filter first and check the brush roll for hair wrap before assuming the battery is the problem. If suction recovers after cleaning, the pack is fine — if it drops again quickly on a clean machine, the cells have aged below useful capacity and replacement is the right call.

Motor cuts out mid-clean then restarts after a short pause

This is an overcurrent trip from the BMS, not a flat battery. It happens when sustained restricted airflow — a clogged filter or a blockage in the nozzle — forces the motor to draw current above the BMS protection threshold. The BMS shuts the output rail to protect the cells, then resets after a few seconds once the current demand drops. Clear any blockage, clean the filter, and restart. If the cutout happens on a clear machine with a clean filter, check that all four cells in the replacement pack are balancing correctly — a single weak cell will push the others to compensate and trip the same fault.