Fmart YZ-X1 Replacement Battery 14.4V 2600mAh Li-ion

Fmart YZ-X1 / YZ-X60 Series — 14.4V Li-ion Replacement Battery

This is a 14.4V Li-ion battery pack rated at 2600mAh (37.44Wh), built to replace the original cell in the Fmart YZ-X1 and related cordless stick vacuums. It fits the YZ-X1, YZ-X75, YZ-X60, YZ-X60C, and 14 additional models in the same family. Swap it in when the original no longer holds charge or triggers a low-battery cutoff too early in a cleaning cycle.

• YZ-X1 / YZ-X60 platform compatibility: These models share the same 14.4V battery bay, connector pinout, and BMS handshake protocol. The motor controller expects a 14.4V nominal rail — feeding it anything lower causes premature low-voltage cutoff, even when cells still have capacity remaining.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the YZ-X1 platform. The BMS responded correctly to charge termination, over-discharge cutoff, and thermal limits. No fault codes triggered during sustained suction load.
• Dock charging habit on Fmart stick vacs: Do not leave the vacuum sitting on the charging dock between uses. Continuous trickle charging on Li-ion cells accelerates capacity fade. Charge the pack fully, then remove it from the dock until the next use.

Suction dropping before the battery indicator reaches low

This is a voltage sag problem, not a capacity problem. When the filter is partially blocked or the brush roll is restricted, the motor draws more current than rated. The extra draw pulls the battery voltage below the motor controller's operating threshold before the cell is actually depleted. The indicator reads mid-charge, but the motor is starved of voltage. Clean the filter and check the brush roll for hair wrap before suspecting the battery.

Motor cutting out mid-clean and then recovering after a pause

This is the BMS tripping on an overcurrent event, not a dead battery. On Fmart stick vacs, sustained suction against a blockage — full dust bin, clogged filter, or restricted nozzle — spikes current draw beyond the BMS threshold. The pack shuts the output to protect the cells, then resets once temperature drops. Clearing the blockage and emptying the bin before the next run keeps current draw within the 2600mAh pack's rated limits. If it trips on a clean, unobstructed floor, verify the charger brought the pack to a full 16.8V before use.