Welmax Jet 3 Replacement Battery 14.8V 2600mAh Li-ion

Welmax Jet 3 — 14.8V Li-ion 2600mAh Replacement Battery

This is a 14.8V, 2600mAh Li-ion replacement battery for the Welmax Jet 3 cordless vacuum cleaner. It fits directly into the Jet 3 and restores full suction power when the original cell has degraded. Capacity is rated at 38.48Wh.

• Jet 3 platform fit: The Jet 3 runs a 14.8V four-cell Li-ion configuration. This battery matches that voltage rail and the BMS handshake the motor controller expects on startup. No adapters or modifications needed.
• Bench tested on actual hardware: We ran this cell through full charge-discharge cycles on the Jet 3 motor platform. The BMS held stable under both hard floor and carpet load conditions, with no overcurrent trips during normal draw.
• Dock charging habit for the Jet 3: Do not leave the Jet 3 sitting on the charging dock indefinitely. Continuous dock contact keeps the battery in a trickle-charge state that accelerates capacity fade. Charge to full, then remove it from the dock.

Suction dropping before the battery indicator reaches low

The Jet 3 motor draws harder when airflow is restricted — a partially blocked filter forces the motor to pull more current to maintain suction. That elevated draw causes voltage to sag on the battery side before the indicator registers low. The result is noticeably weaker suction while the display still shows charge remaining. Clean or replace the filter first; if suction recovers, the battery is not the root cause.

Motor cutting out mid-clean then recovering after a few seconds

This is a BMS overcurrent trip, not a failed battery. When sustained suction restriction pushes motor draw above the BMS threshold, the pack shuts output to protect the cells — then resets once current demand drops. It typically happens on thick carpet runs or when the brush head is partially blocked. Clear the blockage, check the filter, and confirm the charger brings the pack up to 16.8V before the next use.