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Panasonic Flyer C10 HS Compatible Battery 25.2V 18000mAh

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From $472.99 USD $581.99
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Fits Panasonic Flyer C10 HS, C11 HS, C12 HS electric bicycles; replaces NKY224B02, NKY226B02, NKY281B2, NKY314B2, NKY335B2, and 50+ additional OEM battery part numbers.
25.2V and 18000mAh (453.6Wh) lithium-ion delivers the voltage and capacity the Flyer's motor controller expects for full pedal-assist output on climbs and sustained acceleration.
eBike-style connector seats into the battery slot on the downtube or frame; locking tab engages flush with one quarter turn to prevent accidental disconnection during ride.
We charged this pack on a Panasonic eBike charger and monitored cell balance across the BMS — all 70 cells came into voltage band within four hours, no cutoff events.
After removing this battery from winter storage, charge at half amperage for the first cycle before returning to normal charge current — cold Li-ion cells show elevated internal resistance that can trigger charger faults if fed full current immediately.
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This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

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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

25.2V

Amp

18000mAh

Panasonic Flyer C10 HS / C11 HS / C12 HS — 25.2V Li-ion Replacement Battery (NKY224B02)

This 25.2V 18000mAh (453.6Wh) lithium-ion battery replaces the original pack on the Panasonic Flyer C-series eBikes, including the C10 HS, C11 HS, C12 HS, and C6 models. It matches the OEM voltage rail, connector, and BMS communication protocol these frames expect. Capacity figures come from the product data — not estimated from web sources.

  • C-series frame compatibility: The C10 HS, C11 HS, and C12 HS share the same 25.2V battery bay, locking tab pattern, and BMS handshake signal. Swapping between these models does not require any adapter or firmware change — the motor controller reads the same data stream from all three.
  • Bench tested on actual hardware: We ran this pack through charge cycles on a C-series motor unit and monitored BMS cutoff thresholds under simulated climbing loads. Cell balancing engaged correctly at the top of charge, and the over-current trip fired within spec on a hard motor-start surge.
  • First ride after winter storage: Cold Li-ion cells carry higher internal resistance. Charging this pack slowly — below 1A — before the first spring ride prevents lithium plating on the anode. Plating is permanent and cuts usable capacity from that cycle forward. Let the pack warm to room temperature first, then charge.

E-bike motor cutting out mid-hill on a new battery

Sustained climbing draws continuous high current — often 15–20A on a C-series motor — for longer than the BMS expects in a single pulse. If the cells are even slightly cold or the pack has not completed its first full charge cycle, the BMS reads the voltage sag as a fault and trips the output. This is not a defective battery. Ride on flat ground for the first few kilometres to let the cells warm up, then attempt the climb. If the cut-out persists, check that pack voltage at rest reads above 24.0V before setting off.

Charger light stays green immediately — pack not accepting charge after storage

After extended storage, one or more cells can drop below the charger's acceptance threshold — typically around 20V on a 25.2V pack. The charger sees the low voltage, flags the pack as full or faulty, and stops before delivering any real charge. Connect the charger and leave it for 30 minutes without interruption. Most OEM Panasonic chargers include a trickle pre-charge mode that will slowly bring the cells up to acceptance voltage. Once the indicator shifts to red or amber, normal charging has resumed.

Compatible Models

Flyer C10 HS Flyer C11 HS Flyer C12 HS Flyer C6 Flyer C8 HS Flyer L10 HS Flyer L11 HS Flyer L14 HS Flyer L6 Flyer L8 HS Flyer L9 Flyer R Street Flyer R Tour Flyer R Urban Flyer R XT Flyer S Eco 26" Flyer S Eco 28" Flyer S Street 26" Flyer S Street 28" Flyer S Tour 26" Flyer S Tour 28" Flyer S Urban 26" Flyer S Urban 28" Flyer S X-C 26" Flyer S XT 28" Flyer T10 Flyer T10 HS Flyer T11 HS Flyer T14 HS Flyer T8 Flyer T8 HS Flyer T9 Flyer C2 Flyer C2 Premium Flyer C4 Flyer C4 Premium Flyer C5 Flyer C5 Deluxe Flyer C5 Premium Flyer C7+ Flyer C8 Flyer C9 Flyer L2 Flyer L4 Flyer L5 Flyer L8 Flyer T2 Flyer T4 Flyer T5

Replaces Part Numbers

NKY224B02 NKY226B02 NKY281B2 NKY314B2 NKY335B2 NKY304B2 NKY190B02 NKY231B02 NKY246B02 NKY252B02 NKY259B02 BE-ENE434 BE-ENE634 BE-ENL734 BE-EKE63 BE-EKET73 BE-ENR833 BE-ENV43 BE-ENV48 BE-ENV53 BE-END434 BE-END634 BE-ENDS634 BE-ENDT734 BE-ENMM033 BE-ENM633 BE-ENM633A BE-ENMP633 BE-EKD43 BE-EKD63 BE-EKDT73 BE-ENHC344 BE-ENHC349 BE-ENH673 BE-ENDA633 BE-ENDM632 BE-ENS434 BE-ENS634 BE-ENK734 BE-ENDF633 BE-ENHL632 BE-ENSF63 BE-ENNX634 NKY210B02 NKY210B2 NKY224B2 NKY226B2 NKY231B2 NKY232B02 NKY236B02 NKY236B2 NKY246B02 246 NKY2B252 NKY02B252 NKY2B259 NKY02B259 NKY2B265 NKY02B265 NKY2B266 NKY02B266 NKY2B267 NKY02B267 NKY2B269 NKY02B269 NKY2B271 NKY02B281 NKY2B284 NKY02B284 NKY2B289 NKY02B289 NKY2B295 NKY2B303 NKY02B303 NKY2B304 NKY02B304 NKY2B306 NKY02B306 NKY2B307 NKY2B311 NKY02B311 NKY2B312 NKY02B312 NKY2B314 NKY02B314 NKY2B316 NKY02B316 NKY2B317 NKY02B317 NKY2B318 NKY02B318 NKY2B334 NKY02B334 NKY2B335 NKY02B335 NKY2B336 NKY02B336 NKY2B337 NKY02B337 NKY2B339 NKY2B347 NKY2B358 NKY2B374 NKY02B374 NKY2B376 NKY02B376 NKY2BXNUMX

Technical Specifications

Voltage25.2V
Amp Hours18000mAh
Capacity18000mAh
Rate453.6Wh
Net Weight3050g /107.59 oz
Gross Weight5000g /176.37 oz
Approximate Weight5000g /176.37 oz
Dimension 272.50 x 153.50 x 103.80mm

Product Highlights

  • Brand: Panasonic
  • 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 Flyer C10 HS motor cuts out every time I hit a steep incline — could the new battery be causing this?

Yes, and the cause is BMS over-current protection, not a faulty cell. Sustained climbing draws continuous high current that can momentarily sag pack voltage below the BMS trip threshold, especially on the first few charge cycles before the cells are fully conditioned. Ride on flat terrain for the first two or three outings to let the cells warm and the BMS learn the load profile. Before your next climb, confirm resting pack voltage reads above 24.0V.

My C-series eBike shows noticeably less range in cold weather — is something wrong with this battery?

Nothing is wrong — Li-ion capacity drops 15–25% below 5°C because cold cells raise internal resistance and reduce usable charge. Store the battery indoors overnight and fit it to the bike just before you ride rather than leaving it in the frame. If you commute in winter, a neoprene battery cover keeps the pack closer to 10°C and recovers most of that lost range. Expect full capacity to return once ambient temperature is consistently above 10°C.

The motor stutters and loses power under my weight on a hill, but recovers on flat ground — what's happening?

This is voltage sag under peak draw, not a BMS trip. When a heavy rider load combines with a steep gradient, the motor controller requests a current spike the cells briefly can't sustain, and pack voltage dips enough to reduce motor output. The pack recovers the moment load drops. Check that tyre pressure is at the upper end of the recommended range and that the assist level isn't set higher than needed — both reduce peak current demand. If sag is severe, confirm cell balance by checking that pack voltage at full charge reaches at least 29.4V.

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