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BL272 Lenovo Vibe K6 Power Replacement Battery 3.85V 4000mAh

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From $26.99 USD $33.99
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Fits Lenovo Vibe K6 Power and K33A42 models, replaces OEM part BL272.
3.85V 4000mAh Li-Polymer cell restores full charge capacity to this mid-range Android device.
Connector seats flush into the battery slot with no locking tab — orientation marked on the cell.
Bench test showed the BMS accepted charge on first insertion; fuel gauge IC read old cell curve initially.
On first charge after installation, run one full discharge-charge cycle before enabling fast charging to let the coulomb counter recalibrate against the new cell voltage signature.
Delivery time

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

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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

3.85V

Amp

4000mAh

Lenovo Vibe K6 Power — 3.85V Li-Polymer Replacement Battery (BL272)

This is a 3.85V, 4000mAh Li-Polymer replacement battery for the Lenovo Vibe K6 Power (K33A42). It replaces OEM part numbers BL272 and SB18C10605. Swap it in when the original cell no longer holds a charge through a normal day of use.

  • Vibe K6 Power and K33A42 fitment: Both model designations share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The BL272 cell fits either variant without modification — the fuel gauge IC reads the same communication lines on both boards.
  • Bench tested on actual hardware: We cycled this cell on a K33A42 board and confirmed the BMS accepted the new cell without a fault flag. Charge current ramped normally through CC and CV phases, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated reference.

Sudden shutdown at 20–30% on the Vibe K6 Power after a cell swap

This happens because the fuel gauge IC is still using the old cell's voltage-to-capacity curve. When the modem transmits or the screen brightness spikes, current draw pulls the cell voltage down sharply. The IC reads that voltage drop against the wrong curve and sees it as a critical low-voltage event, triggering an emergency shutdown. The fix is one full uninterrupted discharge to 0% followed by a full charge to 100% with fast charging off. After that cycle, the coulomb counter resets to the new cell's actual capacity floor.

Battery percentage jumping erratically after replacement

Erratic percentage jumps — for example, 45% dropping to 12% in under a minute — point to a fuel gauge IC that has not yet recalibrated to the new cell. The IC's stored charge table was built around the degraded original cell and no longer maps accurately to a fresh 4000mAh cell. Run two full discharge-charge cycles with the screen on and mobile data active to force real-load recalibration. After the second cycle, reported percentage should track actual cell voltage within a few points at 3.85V nominal.

Compatible Models

Vibe K6 Power K33A42

Replaces Part Numbers

BL272 SB18C10605

Technical Specifications

Voltage3.85V
Amp Hours4000mAh
Capacity4000mAh
Rate15.4Wh
Net Weight54g /1.90 oz
Gross Weight79g /2.79 oz
Approximate Weight79g /2.79 oz
Dimension 72.80 x 61.50 x 5.00mm

Product Highlights

  • Brand: Lenovo
  • Manufacturer: CS
  • Series: X-Longer
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Lenovo Vibe K6 Power won't turn on at all after the replacement battery sat in a drawer for a few months — is it dead?

Most likely the cell dropped below 2.5V in storage, which triggers a BMS lockout to prevent damage. Plug in the original charger and leave it connected for 20–30 minutes before pressing the power button — the charge IC will trickle current into the cell until it clears the lockout threshold. If the phone still shows nothing after that, check that the battery connector is fully seated; a partially connected BMS line can mimic a dead cell. Once the cell reads above 3.0V, normal charge behaviour resumes.

Fast charging stopped working on my Vibe K6 Power right after I fitted this replacement battery — the phone just charges slowly now.

On the first cycle after a cell swap, the charge IC sometimes defaults to standard charge current because the BMS hasn't yet completed its handshake with the phone's proprietary charge protocol. Complete one full slow charge to 100% and discharge to below 10% under normal use. On the second cycle, reconnect the charger — the protocol negotiation runs again against a now-initialised BMS, and fast charge current should be accepted. If it still won't fast charge after two cycles, confirm you're using the original Lenovo wall adapter, as third-party adapters often fail the voltage handshake entirely.

The Vibe K6 Power feels noticeably warm near the battery while charging after the swap — is that normal?

Some warmth is expected on the first few charges because the new cell has higher internal impedance than a broken-in cell, which means the charge IC dissipates slightly more heat while pushing current through it. The temperature should drop to near-ambient levels by the third or fourth charge cycle as the cell's impedance normalises. If the phone becomes too hot to hold comfortably, stop the charge and check that no debris is caught between the battery and the back cover trapping heat. After break-in, charge temperature on this 3.85V Li-Polymer cell should stay below 40°C under a standard 5V/2A supply.

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