Cleanfriend M488 Replacement Battery 14.4V 4000mAh Ni-MH

Cleanfriend M488 — 14.4V Ni-MH 4000mAh Replacement Battery

This is a 14.4V Ni-MH battery rated at 4000mAh (57.6Wh), built to fit the Cleanfriend M488 cordless vacuum. It replaces the original pack when capacity has dropped and the vacuum loses suction long before the job is done. Swap it in and the motor returns to drawing full voltage across the entire discharge cycle.

• M488 platform fit: The M488 runs a 14.4V drive rail with a connector and cell count that matches this pack exactly. The BMS on this unit monitors cell voltage in groups — a mismatched pack will trigger a no-start condition even if voltage reads close on a multimeter.
• Bench tested on actual hardware: We cycled this pack through repeated full discharge and charge sequences on the M488 platform. The BMS negotiated correctly on the first connection, and the motor drew consistent current without tripping overcurrent protection under normal load.
• Dock charging habit on the M488: Do not leave the M488 sitting on the charging dock permanently. Ni-MH cells on continuous trickle charge develop capacity fade significantly faster than cells charged only when depleted. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low on the M488

This happens when the motor is working harder than rated — usually because a partially blocked filter forces it to draw more current to maintain airflow. That extra draw pulls cell voltage down faster than the indicator circuit expects, so the vacuum feels flat while the indicator still shows charge remaining. Check and clean the filter first. If suction recovers immediately after cleaning, the battery was not the root cause. A cell pack that has genuinely aged will show the same symptom even with a clean filter — if that's the case, this replacement should restore normal motor voltage delivery.

Motor cuts out briefly then recovers mid-clean

This is a BMS overcurrent trip, not a motor fault. It happens when sustained restricted airflow — blocked filter, stuck brush roll, or a hard-floor-to-carpet transition — causes the motor to spike current beyond the pack's trip threshold. The BMS cuts the circuit to protect the cells, then resets after a few seconds. Clear the restriction first. If the cutout keeps happening on unrestricted surfaces with a clean filter, the original cell pack has degraded enough that its internal resistance is amplifying the current spike — replace the pack and retest at 14.4V loaded.