Electrolux EFP31312 14.4V Replacement Battery 2500mAh

Electrolux EFP31312 / Ultimatehome 300 — 14.4V Li-ion Replacement Battery (200GD-INR-H18650CH-4S1P)

This 14.4V, 2500mAh (36Wh) lithium-ion battery pack replaces the original cell in the Electrolux EFP31312, EFR31223, EP31-15GYA, and Ultimatehome 300 cordless stick vacuums. It matches the OEM part number 200GD-INR-H18650CH-4S1P and uses the same 4S1P 18650 cell configuration as the factory pack. Capacity figure is from the product specification — 2500mAh at 14.4V nominal.

• EFP31312 / Ultimatehome 300 platform fit: These models share the same 14.4V voltage rail, physical connector, and BMS handshake protocol. The battery communicates state-of-charge data back to the vacuum's motor controller, so the indicator strip on the handle reads correctly with this pack.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the EFP31312 platform. The BMS held cell balance across all four series cells and tripped overcurrent protection correctly when we simulated a blocked filter draw — no latching fault required to clear.
• Dock charging on cordless vacuums: Do not leave the vacuum sitting on the charging dock permanently. Continuous trickle charging accelerates capacity fade in 4S Li-ion packs faster than almost any other use pattern. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low on the EFP31312

This happens when the motor draws more current than the battery can sustain at its present state of charge, causing voltage to sag below the motor controller's minimum threshold — even while the indicator still shows two or three bars. A partially blocked filter multiplies this effect by forcing the motor to work harder at the same airflow demand. The BMS reads the voltage sag as a low-cell condition and reduces output current to protect the cells. Clean the filter first; if sag continues with a clean filter, the original battery's internal resistance has climbed beyond the point where it can support motor-start current.

Motor cuts out mid-use then recovers after a short pause

This is a BMS overcurrent trip, not a motor fault. When sustained restricted suction — caused by a clogged filter or blocked nozzle — forces the motor to draw above the pack's rated discharge current, the BMS disconnects the output to protect the cells. The trip resets passively after the pack temperature drops and the BMS clears the fault, which is why the vacuum restarts after 30–60 seconds. Check and clear the filter before assuming a battery fault. If trips continue on a clear filter with this replacement pack, measure resting voltage after a full charge — it should read between 16.4V and 16.8V across the pack terminals.