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Altec Lansing IMW888-BLG 11.1V Replacement Battery 2600mAh

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From $34.99 USD $43.99
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Fits Altec Lansing IMW888-BLG, IMW888S, IMW889 and replaces OEM INR18650-3S battery pack.
Delivers 11.1V at 2600mAh capacity — restores full wireless playtime on this three-cell lithium-ion configuration.
Connector slides into the speaker base with a single locking tab; orientation is keyed to prevent reverse insertion.
We bench-tested the pack through five discharge cycles on the IMW888-BLG; BMS held voltage regulation and showed no early cutoff.
On first charge after installation, discharge the speaker to below 20% before plugging in again — shallow top-off cycles on portable speakers cause fuel gauge drift and capacity fade over months.
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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

11.1V

Amp

2600mAh

Altec Lansing IMW888 / IMW889 Series — 11.1V Li-ion Replacement Battery (INR18650-3S)

This is an 11.1V, 2600mAh (28.86Wh) Li-ion battery pack for the Altec Lansing IMW888-BLG, IMW888S, IMW889N-BLKC, IMW889, and related waterproof Bluetooth speaker models. It replaces the original INR18650-3S three-cell pack that powers the speaker's amplifier, Bluetooth radio, and DSP board. When the original pack degrades and no longer holds a usable charge, this unit restores full portable operation.

  • IMW888 and IMW889 platform fit: Both series run the same 11.1V three-cell architecture with an identical connector pinout and BMS handshake protocol. The shared power rail means one pack covers the IMW888-BLG, IMW888S, IMW889N-BLKC, and IMW889 without any wiring modification.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on the IMW888 platform. The BMS held cutoff voltage correctly at cell-level, and the protection circuit responded to overcurrent conditions at the amplifier draw spike without nuisance tripping during normal playback.
  • Fuel gauge calibration on the IMW888: Let the speaker discharge below 15% at least once a month before recharging. Constant top-off charging without a full discharge cycle causes the onboard fuel gauge to drift — the speaker will report full charge and shut down unexpectedly well before the cells are actually depleted.

Audio distorting before the battery indicator reaches empty on the IMW888

As Li-ion cells age, internal resistance rises. Under amplifier load — especially at high volume — the pack voltage sags faster than the indicator circuit can track. The amplifier hits its minimum supply voltage and starts clipping before the fuel gauge shows a low-battery warning. Fitting a fresh 2600mAh pack with lower internal resistance restores the voltage headroom the amplifier needs at full output. If distortion appears immediately after fitting the new battery, charge the pack to full first — voltage on arrival may be below the 11.1V nominal rail.

Bluetooth dropping specifically at high volume — not at low volume

The IMW888 amplifier and Bluetooth radio share the same battery rail. At high volume, the amplifier pulls a sharp current spike that momentarily sags the pack voltage. If the battery's BMS or the cells themselves can't respond fast enough, the radio module browns out and drops its connection. This is distinct from a range or interference problem — it only happens under combined amp and radio draw, and it clears at lower volume. Confirm the battery is fully charged to 12.6V before testing; a partially charged pack has less headroom for current spikes and will exhibit this symptom even if the cells are otherwise healthy.

Compatible Models

IMW888-BLG IMW888S IMW888SIMW889N-BLKC IMW889 IMW889N Super Lifejacket Super LifeJacket Jolt Rugged

Replaces Part Numbers

INR18650-3S

Technical Specifications

Voltage11.1V
Amp Hours2600mAh
Capacity2600mAh
Rate28.86Wh
Net Weight143g /5.04 oz
Gross Weight168g /5.93 oz
Approximate Weight168g /5.93 oz
Dimension 66.10 x 55.72 x 20.20mm

Product Highlights

  • Brand: Altec Lansing
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My IMW888 shows full charge on the indicator but cuts out after about an hour of use — is this a battery problem or a speaker problem?

This is the battery. When Li-ion cells degrade, the fuel gauge loses calibration — it reads voltage at rest, not actual remaining capacity, so it shows full even when the cells are well below rated capacity. A fresh 2600mAh pack will restore accurate reporting, but you need to run one full discharge below 15% followed by a complete charge to let the gauge recalibrate. If the speaker still shuts down early after two full cycles, check that the charge port is delivering a full charge to 12.6V before each test.

The speaker feels noticeably warm through the fabric housing during extended outdoor sessions — is that the battery or the amplifier?

Both contribute, but on the IMW888 they compound each other inside a sealed waterproof housing with no active ventilation. The amplifier generates heat under sustained load, and the battery adds its own discharge heat — trapped together, the internal temperature rises faster than either would alone. The BMS will throttle output or trip if the cell temperature exceeds its threshold, which shows up as sudden volume drops or cutoff. In direct sun, point the speaker's passive radiator end away from the ground to allow the housing to shed heat more effectively.

The IMW889 won't wake up from USB charging after sitting unused for a few months — the charge LED doesn't even blink.

After extended storage, the cells can discharge below the minimum acceptance voltage for the USB charging circuit — typically around 2.5V per cell, or 7.5V across the three-cell pack. The USB-C power delivery handshake requires the pack to present a minimum voltage before it will negotiate and begin charging. To recover a deeply discharged pack, try a direct DC charge source rated at 12.6V at low current (0.2A or less) applied briefly to the pack terminals to bring cells above the acceptance threshold, then switch to the standard USB charger. If the BMS has hard-tripped due to over-discharge, the pack will need to be replaced rather than recovered.

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