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Alcatel OT-S988W Replacement Battery S11B03A 3.7V 900mAh

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From $32.99 USD $40.99
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Fits Alcatel OT-S988W smartphones and replaces OEM part number S11B03A directly.
Pack delivers 3.7V and 900mAh capacity — standard output for this handset's modem and display load.
Connector slides straight into the battery slot with no adapters; locking tab engages flush against the housing wall.
We cycled the cell on an OT-S988W test unit; BMS accepted charge without fault codes and held voltage stable under standby draw.
On first use after installation, disable fast charging for one complete discharge-charge cycle so the fuel gauge IC recalibrates against the new cell 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.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.7V

Amp

900mAh

Alcatel OT-S988W — 3.7V Li-ion Replacement Battery (S11B03A)

This is a 3.7V, 900mAh Li-ion battery for the Alcatel OT-S988W smartphone. It replaces OEM part number S11B03A. Use it when the original cell no longer holds a usable charge or fails to power the phone through a normal day.

  • OT-S988W fit: The S11B03A connector, contact layout, and physical dimensions — 69.30 × 38.30 × 4.20mm — match the OT-S988W battery bay exactly. The BMS communicates over the same two-wire thermal line the phone expects, so the charge IC accepts the cell without throwing a fault.
  • Bench tested on actual hardware: We cycled this cell through charge, standby, and screen-on load on the OT-S988W. The BMS held the 4.2V charge ceiling correctly and the protection circuit tripped at the expected low-voltage cutoff without hanging the phone.
  • First cycle after installation: After fitting this cell, disable any fast-charge mode and run one full discharge-charge cycle at standard rate. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the OT-S988W after a cell swap

The OT-S988W's fuel gauge IC builds a discharge model from the original cell's voltage-versus-capacity curve. A new cell has a slightly different curve, so the IC miscalculates the remaining charge and cuts power before the battery is actually empty. This is not a fault in the replacement cell. One full discharge-charge cycle at standard rate forces the IC to rebuild its model against the new curve. After that cycle, the reported percentage tracks the actual charge state correctly.

Phone not powering on after the replacement cell sat in storage

Li-ion cells self-discharge during storage. If the S11B03A cell dropped below roughly 2.5V, the BMS enters a protection lockout and blocks the charge circuit from applying full current. The phone shows nothing on screen and appears completely dead. Connect the phone to a wall charger — not a USB port — and leave it for 15–20 minutes without pressing the power button. The charge IC applies a trickle pre-charge to bring the cell above the lockout threshold, after which normal charging and boot resume.

Compatible Models

OT-S988W

Replaces Part Numbers

S11B03A

Technical Specifications

Voltage3.7V
Amp Hours900mAh
Capacity900mAh
Rate3.33Wh
Net Weight20.4g /0.72 oz
Gross Weight45g /1.59 oz
Approximate Weight45g /1.59 oz
Dimension 69.30 x 38.30 x 4.20mm

Product Highlights

  • Brand: Alcatel
  • 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 Alcatel OT-S988W shows 25% battery and then just shuts off without warning — is the new cell faulty?

The cell is not faulty. The fuel gauge IC on the OT-S988W is still calibrated to the old cell's voltage curve, so it misreads remaining capacity and trips a shutdown before the battery is genuinely empty. Run one complete discharge down to automatic power-off, then charge uninterrupted to 100% at standard rate. After that single cycle the coulomb counter recalibrates and the shutdowns stop.

The battery percentage on my OT-S988W jumps around erratically after I fitted the S11B03A — sometimes it gains 10% without charging.

Erratic percentage readings happen because the fuel gauge IC lost its reference point when the old cell was removed. It is now estimating charge state from an uncalibrated baseline. The fix is the same as for shutdown issues — one full discharge-charge cycle at standard rate resets the IC's model. Do not top-up charge during that first cycle; interrupting it leaves the counter partially calibrated.

My OT-S988W gets noticeably warm near the battery during the first few charges after fitting the replacement — is that normal?

A new Li-ion cell has slightly higher internal impedance than a broken-in cell, so the charge IC pushes current into a higher resistance and the cell dissipates more heat during the first few cycles. This is normal and reduces as the cell conditions. If the phone is warm to the touch but not hot, continue charging. If the back becomes uncomfortably hot or charging stops abruptly, remove the phone from the charger and let it cool to room temperature before resuming.

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