Arnagar S8 Cordless Vacuum Replacement Battery 14.4V 6700mAh

Arnagar S8 / S8 Pro — 14.4V Li-ion Replacement Battery

This is a 14.4V 6700mAh (96.48Wh) lithium-ion battery that fits the Samsung S8 and S8 Pro cordless stick vacuums. It replaces a degraded or dead original cell, restoring full motor voltage to the cleaning head. Capacity is rated at 6700mAh — match that figure against your original pack before ordering.

• S8 and S8 Pro compatibility: Both models run the same 14.4V power rail and use the same physical connector and BMS handshake. A single cell fits either variant — no hardware difference in the battery bay between the two.
• Bench tested on actual hardware: We cycled this cell under a simulated carpet-load draw profile. The BMS held voltage steady through sustained high-draw passes and tripped correctly when airflow was restricted — no false cutoffs under normal operating conditions.
• Dock charging habit for the S8: Do not leave the S8 on the charging dock permanently. Cordless vacuums on continuous dock charge develop capacity fade significantly faster than those charged only when depleted. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low

This is a voltage sag symptom, not a charge indicator fault. When the motor is working against a partially blocked filter or dense carpet, current draw spikes above the rated load. The BMS responds by reducing available current, which drops motor speed and suction before the indicator registers low. Clean or replace the filter first — if suction stabilises, the battery is not the cause. If the problem persists with a clean filter on a new cell, check that the pack is reading above 14.0V under load.

Motor cutting out briefly then recovering mid-clean

This is a BMS overcurrent trip, not a battery failure. When suction is restricted — blocked brush roll, clogged filter, or a sealed floor attachment — the motor draws more than the BMS threshold. The BMS cuts output, the motor stops, and once current demand drops it resets and restarts. Clear the blockage and inspect the filter before assuming the cell is faulty. If the trip happens on a clean, unobstructed machine, check pack voltage at rest: a cell that rests below 13.5V after a partial charge needs replacement.