GARLYN SR-400 14.4V Cordless Vacuum Replacement Battery 2600mAh

GARLYN SR-400 / SR-600 / SR-700 — 14.4V Li-ion Replacement Battery

This is a 14.4V 2600mAh (37.44Wh) lithium-ion battery for the GARLYN SR-400, SR-600, and SR-700 cordless stick vacuums. It replaces the original pack when capacity has faded or the cell has failed outright. Swap it in and the vacuum runs at full motor voltage again.

• SR-400, SR-600, SR-700 compatibility: All three models run the same 14.4V power rail, share the same connector housing, and use the same BMS handshake protocol. One cell fits the entire line without modification.
• Bench tested on actual hardware: We ran this cell through charge cycles on a GARLYN-series dock and confirmed the BMS negotiated charge acceptance correctly. Voltage held steady at 14.4V nominal under motor-load simulation without triggering overcurrent cutoff.
• Dock charging discipline for SR-series vacuums: Do not leave this vacuum on the charging dock permanently. GARLYN SR-series docks apply a continuous trickle current once the battery reaches full — this degrades cell capacity significantly faster than charge-and-remove cycles. Charge to full, then pull it off the dock.

Suction dropping before the battery indicator reaches low on the SR-400

The SR-400 motor draws higher current the moment airflow is restricted — a partially blocked filter forces the motor to work harder, pulling the cell voltage down faster than the indicator accounts for. The indicator reads state of charge, not actual voltage under load, so it can still show two bars while suction is already weak. A degraded or partially discharged cell hits this sag point earlier in the cycle. Clean the filter first; if suction recovers, the battery was fine — if not, check resting cell voltage, which should sit above 13.0V after a full charge.

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

This is a BMS overcurrent trip, not a mechanical fault. When suction is restricted — blocked nozzle, clogged filter, or carpet pile jamming the brush roll — the motor draws sustained current above the BMS threshold and the protection circuit opens. After a few seconds the BMS resets and power returns. Clear the blockage and check the filter before assuming the battery is at fault. If the cutout happens on an unobstructed run, measure pack voltage under load — a cell dropping below 12.0V under motor start is failing and needs replacement.