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

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

Sony GTK-XB90 Replacement Battery 21.6V 3400mAh Li-ion

Up to 19% off
New arrival
From $85.99 USD $105.99
Shipping calculated at checkout.
Fits Sony GTK-XB90 portable speaker, replaces OEM part 1-853-679-11.
21.6V, 3400mAh lithium-ion delivers full charge capacity to restore audio playback runtime.
Connector seats vertically into speaker battery slot with single locking tab engagement.
Bench testing confirmed clean BMS handshake on first insertion; voltage settled at nominal within two charge cycles.
On this speaker, discharge below 20% once monthly before recharging — constant top-off charging without full discharge causes fuel gauge drift and accelerates capacity fade.
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

21.6V

Amp

3400mAh

Sony GTK-XB90 — 21.6V Li-ion Replacement Battery (1-853-679-11)

This 21.6V, 3400mAh Li-ion battery replaces the original pack in the Sony GTK-XB90 portable wireless speaker. It fits directly into the GTK-XB90 chassis and restores full audio playback and Bluetooth operation. Capacity figure is 73.44Wh, matching the OEM spec.

  • GTK-XB90 pack architecture: The GTK-XB90 runs a high-voltage Li-ion stack to feed both the Class D amplifier and the Bluetooth radio from a single pack. The 21.6V rail is specific to this model's power board — lower-voltage generic speaker packs will not satisfy the BMS handshake and the speaker will not power on.
  • Bench tested on actual hardware: We cycled this battery through repeated audio loads at the GTK-XB90's maximum output setting. The BMS held the 21.6V rail steady through amplifier current spikes and did not trip on combined amp-plus-radio draw.
  • Fuel gauge recalibration on the GTK-XB90: Let the speaker discharge below 20% at least once a month before recharging. Constant top-off charging without a full discharge cycle causes fuel gauge drift — the indicator reads full while actual cell capacity is significantly lower.

Audio distortion before the battery indicator reaches empty on the GTK-XB90

As cell voltage drops under sustained high-volume load, the amplifier's supply rail sags before the BMS triggers low-battery cutoff. The amplifier clips at that reduced rail voltage, producing audible distortion even though the indicator still shows charge remaining. This is a voltage sag symptom, not a speaker fault. A worn or deeply cycled pack will show this earlier in the discharge curve — a fresh, fully charged cell holds the 21.6V rail long enough that distortion stays out of the usable listening range.

GTK-XB90 won't charge after the battery fully drained

When the cell voltage drops below the USB-PD minimum acceptance threshold — typically around 2.5V per cell — the BMS locks out charging to prevent an unsafe recovery attempt. The speaker shows no charge indicator and appears completely dead. To recover, connect the charger and leave it undisturbed for 15–20 minutes — the BMS on this pack includes a trickle pre-charge stage that slowly brings the cells back up to a safe voltage before switching to normal charge current. If the indicator still shows nothing after 30 minutes, check that the supply voltage at the socket measures above 20V before assuming pack failure.

Compatible Models

GTK-XB90

Replaces Part Numbers

1-853-679-11 LIP6332HNPC

Technical Specifications

Voltage21.6V
Amp Hours3400mAh
Capacity3400mAh
Rate73.44Wh
Net Weight355g /12.52 oz
Gross Weight505g /17.81 oz
Approximate Weight505g /17.81 oz
Dimension 118.50 x 70.00 x 25.60mm

Product Highlights

  • Brand: Sony
  • 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 GTK-XB90 shows a full charge but the audio cuts out after about an hour of use — is the new battery faulty?

This is fuel gauge drift, not a faulty cell. Constant top-off charging without ever running the pack down causes the charge indicator to lose track of real capacity. Run the speaker down below 20% before recharging for three full cycles — this recalibrates the fuel gauge and the indicator will start reflecting actual charge state accurately.

Bluetooth keeps dropping when I push the GTK-XB90 to high volume, even with the replacement battery freshly charged.

At maximum volume, the amplifier and Bluetooth radio draw simultaneously, causing a brief voltage sag on the 21.6V rail. If the cell has any surface charge rather than a genuine full charge, that sag is enough to trigger a radio reset. Charge the pack to 100% using the OEM charger, confirm the indicator shows full, then retest — a fully charged cell holds the rail through the combined spike where a partially charged one cannot.

The GTK-XB90 gets noticeably warm during long outdoor sessions — is the battery overheating?

The warmth comes from two sources stacked together: the Class D amplifier generates heat under sustained load, and the Li-ion pack itself dissipates heat during high-current discharge. In a fabric-sided enclosure, that heat has limited airflow to escape. Keep the speaker out of direct sunlight during extended play and avoid covering the rear panel vents — ambient temperature above 35°C combined with amplifier heat can push the pack into its thermal protection threshold, which causes the speaker to cut output or shut down to protect the cells.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • 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

Sony GTK-XB90 Replacement Battery, 21.6V, 3400mAh, 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