Fmart E-550G/W Cordless Vacuum Compatible Battery 14.8V 2600mAh

Fmart E-550G/W — 14.8V Li-ion Replacement Battery

This is a 14.8V, 2600mAh (38.48Wh) lithium-ion battery pack for the Fmart E-550G and E-550W cordless vacuum cleaners. It replaces the original pack when the cell capacity has dropped enough to reduce suction power or shorten cleaning sessions. Voltage and connector match the original unit directly.

• E-550G and E-550W compatibility: Both the G and W variants run the same 14.8V battery rail with an identical connector and BMS handshake. The shared platform means one pack covers both colour variants without modification.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the E-550 platform. The BMS responded correctly to motor-start current draw, held stable voltage under sustained load, and tripped cleanly at the low-cell threshold without dropping the vacuum mid-use.
• Dock charging practice for the E-550: Do not leave the vacuum sitting on the charging dock between uses as a storage habit. The E-550 dock does not interrupt charge once full — continuous trickle current accelerates cell degradation. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low

This happens when the motor is pulling more current than the cell can cleanly sustain at mid-charge. A partially blocked filter forces the motor to work harder, increasing current draw and causing voltage to sag under load — even when the pack still reads mid-charge on the indicator. The BMS throttles output to protect the cells, which the vacuum reads as reduced power rather than a battery fault. Clear the filter and check for blockages in the brush head and hose before concluding the battery is at fault.

Motor cutting out and then recovering after a few seconds

This pattern points to a BMS overcurrent trip rather than a dead cell. When airflow is restricted — blocked filter, jammed brush roll, or a tight carpet pile on maximum suction — the motor current spikes past the BMS protection threshold and the pack shuts the output rail. After a short cool-down the BMS resets and the vacuum restarts normally. The fix is to remove the restriction first: clean the filter, clear the brush roll, and if the problem persists on a clear machine, check that the pack is fully charged above 15.5V before running.