Eureka 4238AZ Cordless Vacuum Compatible Battery 14.4V 2600mAh

Eureka 4238AZ — 14.4V Li-ion Replacement Battery

This is a 14.4V 2600mAh lithium-ion battery for the Eureka 4238AZ cordless stick vacuum. It slots directly into the 4238AZ battery compartment and restores full suction power when the original cell has degraded. Capacity is rated at 37.44Wh, matching the original pack's output voltage and energy specification.

• 4238AZ platform fit: The 4238AZ runs a 14.4V motor rail with a BMS that monitors cell voltage and current draw. This replacement cell matches that voltage rail and carries the correct connector orientation, so the BMS recognises the pack on power-up without error codes.
• Bench tested on actual hardware: We cycled this battery through sustained suction loads on the 4238AZ motor. The BMS held its overcurrent threshold correctly and did not trip under normal carpet operation. Cell voltage at end-of-charge settled at 16.8V as expected for a 4S Li-ion configuration.
• Dock charging on the 4238AZ: Do not leave the 4238AZ sitting on its charging dock continuously. Constant trickle charge shortens Li-ion cell capacity faster than periodic charge cycles. Charge to full, then remove the vacuum from the dock until the next use.

Suction dropping before the battery indicator reaches low

The 4238AZ motor draws significantly more current when airflow is restricted — a partially blocked filter can push draw well above rated amps. The BMS reads this as a voltage sag event and throttles output to protect the cells, which the user feels as a suction drop rather than a battery warning. The indicator LED responds to state-of-charge, not instantaneous current draw, so it can still show mid-charge when the motor is already being throttled. Clean or replace the filter first, then recheck suction before assuming the battery is the cause.

Motor cuts out mid-clean then recovers after a few seconds

This is a BMS overcurrent trip, not a motor fault. When sustained suction restriction forces the motor to pull current above the BMS cutoff threshold, the pack disconnects the output rail to protect cells from over-discharge under load. After a few seconds, the BMS resets and allows power again — which is why the vacuum recovers on its own. Check the filter and clear any blockage in the nozzle or hose before the next run to keep draw within the BMS threshold.