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Hoover H Free 21.6V Replacement Battery HF122BAT

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From $102.99 USD $126.99
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Fits Hoover H Free stick vacuums; replaces HF122BAT, 35601729, and B012 battery packs.
21.6V and 2000mAh capacity deliver motor power for floor and surface cleaning cycles.
Connector slides into the H Free grip with a locking tab; orientation is keyed.
We bench-tested the BMS on a H Free frame — voltage held steady under sustained motor load.
Do not leave this battery on the charging dock continuously; trickle charge degrades capacity faster than 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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

21.6V

Amp

2000mAh

Hoover H Free Series — 21.6V Li-ion Replacement Battery (HF122BAT)

This 21.6V 2000mAh lithium-ion battery replaces the original HF122BAT cell in the Hoover H Free cordless stick vacuum. It fits the HF122EN011, HF122PTA011, HF122RH011, and related H Free variants. Voltage and capacity match the factory spec exactly — 21.6V, 2000mAh, 43.2Wh.

  • H Free platform compatibility: All H Free models on this listing share the same 21.6V battery rail, connector pinout, and BMS handshake protocol. Swapping between models in this range is not supported — the battery is locked to this voltage tier by the vacuum's motor controller.
  • Bench tested on actual hardware: We ran this cell through the H Free charging cycle and confirmed the BMS negotiates correctly with the stock charger. Charge acceptance was normal, and the protection circuit tripped at the expected overcurrent threshold during a simulated blockage test.
  • Dock charging behaviour on the H Free: Remove the vacuum from the charging dock once the indicator shows full. The H Free dock does not cut trickle charge automatically after completion, so cells left docked continuously develop capacity fade faster than those charged only when depleted.

Suction dropping before the battery indicator reaches low

On the H Free, suction loss often gets blamed on the battery when the real cause is a partially blocked filter forcing the motor to draw above its rated current. The BMS reads this elevated draw and begins stepping down power delivery to protect the cell — suction drops but the battery LED still shows charge remaining. Clean or replace the foam and HEPA filters first. If suction recovers immediately after cleaning, the battery was not the fault.

Motor cuts out mid-clean and then restarts after a pause

This is a BMS overcurrent trip, not a dead battery. Sustained restricted airflow — usually a full dust cup or a clogged cyclone inlet — pushes motor current above the protection threshold and the BMS disconnects the cell. After 30–60 seconds, the BMS resets and power returns. Empty the dust cup, clear the cyclone mesh, and check that the filter is seated correctly. If cut-outs continue on a clear machine, measure resting cell voltage — a healthy pack at partial charge should read above 20V.

Compatible Models

H Free HF122EN011 HF122PTA011 HF122RH011 HF122GPT011 HF122RPT001 HF122GH001 HF122GH HF122RPT HF122GPT HF122RH HF122PTA 011 HF122EN 011 HF122MPA 011 HF122UH 011 HF122CAR 011 HF122AH 011 H Free 100 H-Free 100

Replaces Part Numbers

HF122BAT 35601729 B012

Technical Specifications

Voltage21.6V
Amp Hours2000mAh
Capacity2000mAh
Rate43.2Wh
Net Weight402g /14.18 oz
Gross Weight582g /20.53 oz
Approximate Weight582g /20.53 oz
Dimension 147.80 x 87.50 x 46.00mm

Product Highlights

  • Brand: Hoover
  • 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 Hoover H Free loses suction halfway through a clean but the battery light still shows green — is the battery failing?

Not necessarily. When the H Free filter or cyclone is even partially restricted, the motor pulls more current than rated and the BMS steps down power to protect the cell — suction drops while the indicator still reads healthy. Clean the foam pre-filter and HEPA filter, empty the dust cup, and run again. If suction returns to normal, the battery is fine and the filter was the cause.

The H Free motor cuts out for about a minute then comes back on by itself — what is happening?

That is the battery BMS tripping on overcurrent. A blocked filter, full dust cup, or obstructed brush roll forces the motor to spike above the protection threshold, and the BMS disconnects the cell until it resets. Clear the blockage, check the brush roll for tangled fibres, and restart. If the cut-out happens again on a clean machine with no restriction, check resting cell voltage — it should sit above 20V between cycles.

The new replacement battery fades noticeably after only a few weeks — did I get a bad cell?

In most cases this is dock-charging damage, not a defective cell. The H Free charging dock does not terminate trickle charge automatically, so leaving the vacuum docked between every use applies continuous low-level charge that degrades capacity faster than normal cycling. Charge only when the battery is depleted, remove the vacuum from the dock once the indicator shows full, and store it off the dock. Capacity should stabilise after several proper charge cycles.

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