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Lenovo L14D1P31 Yoga Tablet 7 Replacement Battery 3.8V 3400mAh

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From $26.99 USD $33.99
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Fits Lenovo Yoga Tablet 7 model PB1-770N, replacing OEM part L14D1P31.
This 3.8V, 3400mAh lithium-polymer cell restores full charge capacity to the tablet.
Connector seats flush into the battery slot with no locking tab required.
We cycled the pack through ten full discharge-charge loops; BMS accepted input cleanly.
On first power-up after installation, let the tablet fully discharge once before regular use — the fuel gauge IC needs one complete cycle to recalibrate against this cell's discharge curve.
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

3.8V

Amp

3400mAh

Lenovo PB1-770N / PB1-770N Dual SIM TD-LTE — 3.8V Li-Polymer Replacement Battery (L14D1P31)

This is a 3.8V, 3400mAh Li-Polymer replacement battery for the Lenovo Yoga Tablet 7 (PB1-770N), including the Dual SIM TD-LTE variant. Part number L14D1P31 matches the OEM cell format and connector. Dimensions are 96.60 × 83.13 × 2.80 mm — measure your existing cell before installing.

  • PB1-770N and Dual SIM TD-LTE coverage: Both variants share the same motherboard power rail, L14D1P31 connector pinout, and BMS handshake protocol. One cell covers both SKUs without modification.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on a PB1-770N unit. The BMS negotiated charge termination correctly at 4.35V and held the cutoff floor at 3.0V under load without triggering premature shutdown.
  • First-cycle fuel gauge reset on the PB1-770N: After installation, disable fast charging and run one full discharge-to-charge cycle. The tablet's fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve on that first pass — skipping this step causes percentage jumps and false low-battery shutdowns.

Sudden shutdown at 20–30% on the PB1-770N after a cell swap

The PB1-770N's SoC draws a short, high-current spike when the screen brightness peaks or Wi-Fi reassociates. A new cell with an uncalibrated fuel gauge IC can show 25% remaining while the actual cell voltage has already sagged below 3.2V under that load spike. The BMS interprets the voltage drop as a hard undervolt and cuts power instantly. Running one full discharge cycle forces the coulomb counter to map the real capacity curve of the new cell, eliminating the mismatch between displayed percentage and actual voltage state.

Battery percentage jumping erratically on the Yoga Tablet 7 after replacement

The fuel gauge IC on the PB1-770N was calibrated to the impedance profile of the original cell. A new cell has a different internal resistance, so the IC's voltage-to-percentage lookup table produces erratic jumps — often skipping 10–15% in seconds. This is not a faulty cell. Discharge the tablet fully until it shuts down, then charge uninterrupted to 100% without removing the charger. After that single cycle the fuel gauge IC anchors its endpoints and the percentage display stabilises.

Compatible Models

PB1-770N PB1-770N Dual SIM TD-LTE

Replaces Part Numbers

L14D1P31

Technical Specifications

Voltage3.8V
Amp Hours3400mAh
Capacity3400mAh
Rate12.92Wh
Net Weight54g /1.90 oz
Gross Weight89g /3.14 oz
Approximate Weight89g /3.14 oz
Dimension 96.60 x 83.13 x 2.80 mm

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

The Yoga Tablet 7 won't turn on at all after sitting in a drawer for months — is the new battery dead on arrival?

Almost certainly not. When a Li-Polymer cell drops below roughly 2.5V in storage, the BMS locks the output rail to protect the cell from damage — the tablet will not respond to the power button. Connect the original charger and leave it for 20–30 minutes without pressing anything; the charge IC feeds a trickle current that brings the cell above the BMS re-enable threshold. Once the BMS unlocks, the tablet will boot normally and charge from there.

Fast charging stopped working after I installed the L14D1P31 replacement — the tablet now charges slowly even with the original adapter.

The PB1-770N's charge controller negotiates current level with the BMS on the first connection after a cell swap. On that first cycle, some BMS units default to a conservative 0.5C rate until they complete one full charge handshake. Disconnect the charger, power the tablet off completely, then reconnect. If fast charge still doesn't resume, complete one full discharge-charge cycle — the charge controller re-negotiates the current profile after the coulomb counter has a baseline reading from the new cell.

The tablet feels warm near the battery during charging but not near the charge port — is this the new cell overheating?

Mild warmth at the cell itself is expected on the first few charge cycles. A new high-impedance cell dissipates slightly more energy as heat while the charge IC ramps current up — internal resistance drops after the first two to three cycles as the cell's electrode surfaces condition. If the back of the tablet stays below approximately 40°C to the touch, this is within normal range. If it becomes hot enough to be uncomfortable, stop charging and check that the charge rate has not been forced above 1C by a third-party app.

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