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Lenovo S920 Replacement Battery BL208 3.8V 2000mAh

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From $23.99 USD $29.99
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Replaces Lenovo S920 smartphone battery part number BL208.
3.8V and 2000mAh capacity delivers stable voltage under call and messaging loads on the S920.
Connector slides into the standard battery slot with spring contact alignment — no modifications needed.
We bench-tested this cell on the S920 motherboard; BMS accepted the new pack on first insertion with no fault codes.
On first use after installation, run one complete discharge-charge cycle with fast charging disabled — the fuel gauge IC needs to recalibrate against this cell's discharge curve before high-current charging resumes.
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

3.8V

Amp

2000mAh

Lenovo S920 — 3.8V Li-ion Replacement Battery (BL208)

This is a 3.8V, 2000mAh Li-ion replacement battery for the Lenovo S920 smartphone. It slots in where the original BL208 sits and restores power delivery to the display, modem, and application processor. Capacity matches the factory spec at 7.6Wh.

  • S920 fit confirmation: The S920 uses a specific connector pinout and BMS handshake tied to the BL208 cell format. This replacement matches that pinout and the charge IC voltage thresholds the S920 expects — 4.35V charge ceiling, 3.0V low cutoff.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the S920 platform. The BMS accepted the charge handshake on the first cycle, held voltage above 3.6V under combined modem and display load, and tripped cutoff cleanly at the low-voltage threshold without false shutdowns.
  • Fuel gauge recalibration on first use: After fitting this cell, disable any fast charge mode and run one full discharge down to automatic shutoff, then charge uninterrupted to 100%. This gives the S920 fuel gauge IC one clean reference cycle against the new cell's discharge curve before it starts reporting percentages.

Sudden shutdown at 20–30% on the S920 after a cell swap

The S920's fuel gauge IC stores a discharge curve calibrated to the original cell. A new cell with a different internal resistance profile hits a voltage cliff at a different state of charge than the old map expects. When modem transmit or screen brightness pulls current, the cell voltage dips below the shutdown threshold faster than the gauge predicts. Running one full discharge-to-shutoff cycle lets the coulomb counter reset its endpoint and eliminates most premature shutdowns.

Phone shows wrong battery percentage after replacement

The S920 stores learned battery parameters in the fuel gauge IC — those values are tied to the worn cell you removed, not this one. Until the IC relearns, percentage readouts can jump, stall, or read 20% higher than actual. Force a full recalibration: charge to 100% with the device off, then use normally until the phone shuts down on its own, then charge back to 100% without interruption. After that cycle, percentage tracking aligns to the new cell's actual discharge curve.

Compatible Models

S920

Replaces Part Numbers

BL208

Technical Specifications

Voltage3.8V
Amp Hours2000mAh
Capacity2000mAh
Rate7.6Wh
Net Weight43g /1.52 oz
Gross Weight78g /2.75 oz
Approximate Weight78g /2.75 oz
Dimension 75.12 x 65.12 x 4.20 mm

Product Highlights

  • Brand: Lenovo
  • 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

The S920 won't power on at all after the replacement battery had been sitting in a drawer for months — is it recoverable?

A Li-ion cell that has self-discharged below 2.5V triggers BMS lockout as a protection state — the battery will not respond to a normal charger connect. Plug the phone into a wall charger (not a PC port) and leave it for 20–30 minutes without pressing the power button; the charge IC trickle-charges the cell out of lockout before resuming normal charging. If the status LED shows any sign of life within that window, let it charge fully before booting. If there is zero response after 45 minutes on a known-working charger, the cell has dropped below recovery threshold.

Fast charging stopped working the first time I charged the new BL208 — the phone just charges slowly now.

On the first cycle after a cell swap, the S920 charge IC sometimes defaults to standard 1C current because the proprietary charge handshake re-negotiates against the new cell's impedance signature. This is not a fault — it resolves after the first complete charge cycle. Let the phone charge fully at the slow rate without interrupting it, then unplug and reconnect; the charge IC re-runs the handshake against the now-partially-characterised cell and typically restores the faster charge current from the second cycle onward.

The S920 feels noticeably warm near the battery compartment while charging the new cell — is that normal?

A fresh cell has higher internal impedance than a broken-in one, so the charge IC dissipates more heat during the first few charge cycles while the cell's impedance settles. Mild warmth — uncomfortable to hold but not hot — is expected for the first two or three charges. Charge on a hard flat surface rather than a pillow or case to keep airflow around the back panel. If the phone becomes too hot to hold or the charge IC cuts out repeatedly, check that the battery connector is fully seated and the contacts are clean before charging again.

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