Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Logitech Ultimate Ears Blast Replacement Battery 3.7V 2600mAh

Up to 20% off
New arrival
From $28.99 USD $35.99
Shipping calculated at checkout.
Fits Logitech Ultimate Ears Blast speaker; replaces OEM part T12367470JTZ.
3.7V 2600mAh lithium-ion cell delivers 9.62Wh to restore full audio output and wireless range on your Blast unit.
Connector slides into the battery chamber with a single locking tab; orientation is keyed — forces only one way.
We bench-tested this cell in the Blast platform at full volume for sustained playback; BMS accepted the pack on first insertion with no fault codes.
Discharge the Blast below 20% charge at least once a month before refilling — constant top-off charging causes fuel gauge drift and accelerates capacity fade on this Li-ion cell.
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
WECARE5

Please Confirm Delivery Timeline

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
4.8
★★★★★
★★★★★
Average Customer Rating
By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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

3.7V

Amp

2600mAh

Logitech Ultimate Ears Blast — 3.7V Li-ion Replacement Battery (T12367470JTZ)

This 3.7V 2600mAh (9.62Wh) Li-ion battery replaces the original cell in the Logitech Ultimate Ears Blast portable Bluetooth speaker. It fits models 984-000967, 1749LZ0PSAS8, and 884-000741. When the original cell degrades and the speaker no longer holds charge through a full listening session, this is the direct replacement.

  • Ultimate Ears Blast compatibility: All listed model variants share the same 3.7V single-cell architecture, connector pinout, and BMS handshake. The replacement cell matches that voltage rail and passes the onboard fuel gauge initialisation without triggering a fault state.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the Blast platform, confirmed BMS acceptance at first connection, and verified the fuel gauge updated correctly across the full state-of-charge range without a stuck or false reading.
  • Monthly discharge cycle on the Blast: Run the speaker down below 20% at least once a month before recharging. Constant top-off charging without a full discharge causes fuel gauge drift on this cell and accelerates capacity fade — the speaker will report full charge while actual usable capacity quietly shrinks.

Why the Blast reports full charge but audio cuts out after extended play

The Blast combines amplifier draw and Bluetooth radio draw on the same cell. Under sustained loud playback, the combined current pull causes voltage to sag faster than the fuel gauge recalculates. The BMS reads the sag as a low-voltage event and cuts output before the indicator reaches empty. Replacing a degraded cell — one with elevated internal resistance — eliminates the sag that triggers early cutoff.

Speaker won't respond to USB charging after sitting unused for months

If the Blast sat discharged for an extended period, the cell voltage can drop below the USB-C PD minimum acceptance threshold — typically under 2.5V on a 3.7V nominal cell. The charger handshake fails before any current flows into the battery. Connect the speaker to a 5V USB-A source first rather than a USB-C PD adapter, hold the power button for 10 seconds, then switch to the standard charger once the cell has recovered above the acceptance threshold.

Compatible Models

Ultimate Ears Blast 984-000967 1749LZ0PSAS8 884-000741

Replaces Part Numbers

T12367470JTZ

Technical Specifications

Voltage3.7V
Amp Hours2600mAh
Capacity2600mAh
Rate9.62Wh
Net Weight50g /1.76 oz
Gross Weight120g /4.23 oz
Approximate Weight120g /4.23 oz
Dimension 66.80 x 21.00 x 18.50mm

Product Highlights

  • Brand: Logitech
  • 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 Blast shows a full battery but the audio cuts out or gets choppy after about an hour of loud playback — what's causing that?

The amplifier and Bluetooth radio both draw from the same single cell, and at high volume that combined current spike causes voltage to sag sharply. The BMS interprets that sag as a low-voltage fault and shuts output before the indicator moves. This is almost always a degraded cell with rising internal resistance, not a charging fault. Replacing the cell resolves the sag — a fresh 2600mAh cell at 3.7V nominal handles the combined draw without triggering premature cutoff.

The audio from my Blast starts distorting and sounds clipped even though the battery indicator still shows charge remaining — is that a speaker fault?

It's not the driver — it's voltage sag hitting the amplifier before the fuel gauge catches up. When the cell voltage drops under combined amp and radio load, the amplifier clips because it's no longer receiving stable supply voltage, even if the indicator hasn't moved. The distortion clears temporarily when you lower the volume because the current draw drops and voltage recovers. Swap the cell and confirm the speaker plays cleanly at full volume before the indicator falls below 30%.

I charge my Blast every night from my desk even though it's never fully drained — now the playtime seems much shorter than it used to be. Is the battery actually dead?

Constant shallow cycling without ever fully discharging causes fuel gauge drift and accelerates capacity fade on the Li-ion cell inside the Blast. The cell isn't necessarily dead, but it's lost usable capacity from never completing a full discharge cycle. Run the speaker down below 20% at least once a month — this recalibrates the fuel gauge and slows cell degradation. If capacity has already dropped significantly, replacing the cell and then maintaining that monthly full-discharge habit will restore and preserve playtime.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Logitech Ultimate Ears Blast Replacement Battery, 3.7V, 2600mAh, Li-ion 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections