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Electrolux Pure F9 Replacement Battery 36V 2000mAh

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From $82.99 USD $102.99
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Fits Electrolux Pure F9 and FlexLift PF9 models, replaces OEM part 140144439084.
36V 2000mAh lithium-ion pack delivers stable voltage to the motor under sustained suction load.
Battery slides into the vertical slot with a single locking tab on the left side.
We bench-tested this cell on a Pure F9 motor load — BMS held steady, no premature cutoff events.
Do not leave this battery on the charging dock continuously; dock trickle charge degrades capacity significantly faster than standard charge-and-remove cycles.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

36V

Amp

2000mAh

Electrolux Pure F9 / FlexLift PF9 Series — 36V Li-ion Replacement Battery (140144439084)

This 36V 2000mAh (72Wh) Li-ion battery replaces the original power pack in the Electrolux Pure F9 and FlexLift PF9 series cordless stick vacuums. It fits the PF91-6BWF and the broader Pure F9 FlexLift range. The OEM part number 140144439084 is the primary reference for this cell.

  • Pure F9 and FlexLift PF9 platform fit: These models share the same 36V bus, connector housing, and BMS handshake protocol. The battery slides into the same locking bay and communicates charge state to the vacuum's power management board without modification.
  • Bench tested on actual hardware: We ran this cell through the F9 charge cycle and confirmed the BMS handshake with the dock. The protection circuit responded correctly to overcurrent conditions — cutting out and resetting cleanly — and the charge indicator updated as expected throughout the cycle.
  • Dock charging discipline on the F9: Do not leave the F9 sitting on the charging dock indefinitely between uses. Continuous trickle charge through the dock accelerates capacity fade in Li-ion cells at this voltage. Charge to full, then remove the vacuum from the dock until the next use.

Suction dropping before the battery indicator reaches low

The F9's motor draws harder when airflow is restricted — a blocked filter or partial blockage raises current draw, which triggers early voltage sag at the battery terminals even when the cell still holds charge. The vacuum's power board reads this sag as low voltage and steps the motor back before the indicator reflects actual state of charge. Clean or replace the filter first. If suction recovers at lower power settings with a clean filter, the issue is airflow restriction, not battery capacity.

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

This is a BMS overcurrent trip, not a cell failure. When the F9 motor sustains a high-draw condition — dense carpet, a partial clog, or heavy debris — current briefly spikes past the BMS threshold and the protection circuit opens. The pack cools and resets within seconds, and the vacuum restarts normally. If the cutout repeats within the same cleaning session, check that the filter is clear and that no blockage is restricting the suction path. A clean, unobstructed airway keeps motor current within the BMS's rated operating window.

Compatible Models

Pure F9 FlexLift PF9 PF91-6BWF Pure F9 FlexLift 900277599 PF91-4ST 900277600 PF91-4IG 900277601 PF91-6IBM 900277602 PF91-ANIMA 900277603 PF91-ALRGY 900277604 FX9-1-4IG 900277605 FX9-1-IBM 900277606 FX9-1-MBM 900277607 FX9-1-ANIM 900277608 FX9-1-4ST 900277609 FX9-1-MBM 900277610 FX9-1-ANIM 900277614 FX9-1-ALRP 900277616 PF91-ALRP 900279101 PF91-4ST 900279102 PF91-4IG 900279103 PF91-6IBM 900279104 PF91-ANIMA 900279105 PF91-ALRGY 900279106 FX9-1-4ST 900279107 FX9-1-4IG 900279108 FX9-1-IBM 900279109 FX9-1-MBM 900279110 FX9-1-ANIM 900279111 FX9-1-ALRG 900279112 FX9-1-4ST 900279113 FX9-1-4IG 900279114 FX9-1-IBM 900279115 FX9-1-MBM 900279116 FX9-1-ANIM 900279117 FX9-1-ALRG 900279120 PF91-6EG 900279121 PF91-6EB 900279122 PF91-6PR 900279138 PF91-6BWF 900279140 PF91-6BWF 900279141 PF91-6BWF 900279142 PF91-6BWF 900279143 PF91-6BWF 900279145 PF91-6BMF 900279146 PF91-6BMF 900279147 PF91-6BMF 900279148 PF91-6BW 900279149 FX9-1-ALRP 900279155 PF91-ALRP 90027911101 FX9-1-ALRG 90027913500 PF91-6ESF 90027910401 PF91-ANIMA 90027912101 PF91-6EB 90027911400 FX9-1-IBM 90027913701 PF91-6BWF 90027914600 PF91-6BMF 90027914400 PF91-6BMF 90027760300 PF91-ALRGY 90027912000 PF91-6EG 90027914901 FX9-1-ALRP 90027760200 PF91-ANIMA 90027910701 FX9-1-4IG 90027911401 FX9-1-IBM 90027910100 PF91-4ST 90027911001 FX9-1-ANIM 90027913800 PF91-6BWF 90027915500 PF91-ALRP 90027911100 FX9-1-ALRG 90027761000 FX9-1-ANIM 90027760000 PF91-4IG 90027760700 FX9-1-ANIM 90027910901 FX9-1-MBM 90027910101 PF91-4ST 90027761600 PF91-ALRP 90027761400 FX9-1-ALRP 90027910201 PF91-4IG 90027910301 PF91-6IBM 90027912001 PF91-6EG 90027913600 PF91-6XRF 90027760100 PF91-6IBM 90027914801 PF91-6BW 90027914301 PF91-6BWF 90027760800 FX9-1-4ST 90027914000 PF91-6BWF 90027914201 PF91-6BWF 90027910501 PF91-ALRGY 90027911000 FX9-1-ANIM 90027914501 PF91-6BMF 90027910601 FX9-1-4ST 90027911201 FX9-1-4ST 90027914601 PF91-6BMF 90027914100 PF91-6BWF 90027914800 PF91-6BW 90027914700 PF91-6BMF 90027913700 PF91-6BWF 90027911601 FX9-1-ANIM 90027913801 PF91-6BWF 90027760500 FX9-1-IBM 90027910300 PF91-6IBM 90027910600 FX9-1-4ST 90027910900 FX9-1-MBM 90027911600 FX9-1-ANIM 90027914101 PF91-6BWF 90027914500 PF91-6BMF 90027910200 PF91-4IG 90027911200 FX9-1-4ST 90027760400 FX9-1-4IG 90027911301 FX9-1-4IG 90027913501 PF91-6ESF 90027759900 PF91-4ST 90027914401 PF91-6BMF 90027910700 FX9-1-4IG 90027914001 PF91-6BWF 90027760600 FX9-1-MBM 90027910800 FX9-1-IBM 90027911501 FX9-1-MBM 90027910500 PF91-ALRGY 90027911701 FX9-1-ALRG 90027914300 PF91-6BWF 90027914701 PF91-6BMF 90027911700 FX9-1-ALRG 90027911300 FX9-1-4IG 90027910801 FX9-1-IBM 90027914200 PF91-6BWF 90027912100 PF91-6EB 90027910400 PF91-ANIMA 90027911500 FX9-1-MBM 90027913601 PF91-6XRF 90027760900 FX9-1-MBM 90027914900 FX9-1-ALRP

Replaces Part Numbers

140144439084 56646710099

Technical Specifications

Voltage36V
Amp Hours2000mAh
Capacity2000mAh
Rate72Wh
Net Weight522g /18.41 oz
Gross Weight592g /20.88 oz
Approximate Weight592g /20.88 oz
Dimension 94.00 x 94.00 x 61.30mm

Product Highlights

  • Brand: Electrolux
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Electrolux Pure F9 loses suction well before the battery light shows low — is the battery actually flat?

Not necessarily. A restricted filter forces the motor to draw more current than rated, causing voltage to sag at the battery terminals. The vacuum's power board reads that sag as low voltage and dials the motor back, even though the cell still holds charge. Clean or replace the filter and test again — if suction improves at the same charge level, the battery is not the cause.

The F9 motor shuts off mid-clean and restarts on its own after a few seconds — what's happening?

That's the BMS tripping on an overcurrent spike. Thick carpet, a partial blockage, or heavy debris causes a short current surge that pushes past the protection circuit's threshold, so it opens the circuit. The pack resets once the current normalises, usually within seconds. Check the filter and the entire suction path for any restriction — clearing the blockage keeps the draw within the BMS operating range and stops the trips.

My new replacement battery is fading noticeably faster than the original did when it was fresh — what causes that?

Continuous dock charging is the most common cause. Li-ion cells at 36V that are held at full charge through a trickle-feed dock degrade faster than cells that rest off the charger between uses. Charge the battery to full, then remove the F9 from the dock and store it off the dock until the next session. If the vacuum is only used once or twice a week, this single habit change extends usable capacity significantly.

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