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Electrolux Pure F9 Replacement Battery 36V 3000mAh

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From $108.99 USD $134.99
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Fits Electrolux Pure F9 and FlexLift PF9 models; replaces OEM part 140144439084.
36V, 3000mAh lithium-ion delivers full motor power across carpet and hard floors without stepdown.
Connector slides straight in; locking tab seats flush with the battery housing slot.
We ran full discharge cycles on the Pure F9 motor load; BMS held steady at rated voltage with no premature cutoff.
Do not leave this battery on the charging dock continuously — trickle charge degrades capacity fast, so charge fully and remove immediately.
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.

Disclaimer

⚠️ 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

3000mAh

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

This is a 36V, 3000mAh (108Wh) lithium-ion replacement battery for the Electrolux Pure F9 and FlexLift PF9 series cordless stick vacuums. It fits the PF91-6BWF and the broader Pure F9 FlexLift range. It slots into the same battery bay as the original and connects to the same charging circuit.

  • Pure F9 and FlexLift PF9 platform fit: These models share the same 36V battery bay, connector pinout, and BMS communication protocol. The OEM part numbers 140144439084 and 56646710099 cover the full range, so one cell covers the entire F9 family without modification.
  • Bench tested on actual hardware: We ran this battery through charge and discharge cycles on a Pure F9 unit. The BMS handshake completed correctly, the charger recognised the cell without fault codes, and the motor draw stayed within BMS trip thresholds across all suction modes.
  • Dock charging practice on the Pure F9: The Pure F9 charging dock does not cut power automatically when the battery reaches full. Leaving the vacuum docked continuously exposes the lithium cells to sustained trickle current. Charge to full, then remove the vacuum from the dock to protect cell capacity over time.

Suction dropping before the battery indicator reaches low

This is a voltage sag issue, not a capacity issue. When the filter is partially blocked or airflow is restricted, the motor draws above its rated current. The BMS reads the resulting voltage sag as a low-battery condition and reduces power output to protect the cells. The battery indicator can still show two or three bars while suction falls noticeably. Check and clean the filter first — if sag continues on a clean filter, the cell itself may have degraded below 32V under load.

Motor cuts out mid-clean and recovers after a short pause

This is a BMS overcurrent trip, not a dead battery. The BMS shuts the output when sustained high current — typically from a blocked filter or partial blockage in the brush head — exceeds the trip threshold. After a short pause the BMS resets and power returns. The trip is a protection event, not a fault in the replacement cell. Clear the blockage or filter restriction and the trip stops. If the motor still trips on a clear filter, check that the brush head roll is not jammed, as a seized roll drives the same overcurrent condition.

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 Hours3000mAh
Capacity3000mAh
Rate108Wh
Net Weight540g /19.05 oz
Gross Weight610g /21.52 oz
Approximate Weight610g /21.52 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 Pure F9 suction feels weak even though the battery shows it's not low — what's happening?

This is voltage sag under restricted airflow, not a flat battery. A partially blocked filter forces the motor to pull more current than rated, which drops cell voltage under load — the BMS reads this as reduced power headroom and cuts motor output. The battery indicator measures resting voltage, so it can still show charged while suction suffers. Clean the filter and check the brush head for blockage, then test at full suction mode again.

The motor on my Pure F9 keeps cutting out for a few seconds then comes back on — is the battery faulty?

That pattern is a BMS overcurrent trip, not a failed cell. When airflow is blocked — usually a clogged filter or a jammed brush roll — the motor draws above the BMS trip threshold and the output shuts momentarily to protect the cells. The BMS resets itself after a short pause, which is why power returns. Clear the filter and check the brush roll is spinning freely; if the cut-outs stop, the replacement cell is fine.

My Pure F9 battery fades much faster than it used to — I leave it on the dock between uses. Could the dock be causing it?

Yes, continuous dock charging is a well-documented cause of capacity fade in lithium-ion cordless vacuums. The Pure F9 dock does not stop delivering current once the battery reaches full charge, so cells sitting on the dock experience prolonged trickle current that accelerates capacity loss. A replacement cell will restore rated capacity, but it will degrade at the same rate if left on the dock indefinitely. Charge to full, remove the vacuum from the dock, and store it off the charger until the next clean.

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