About this replacement
Sony GTK-XB90 — 21.6V Li-ion Replacement Battery (1-853-679-11)
This is a 21.6V 2600mAh (56.16Wh) Li-ion replacement battery for the Sony GTK-XB90 portable Bluetooth party speaker. It fits directly in place of OEM part 1-853-679-11 (also cross-referenced as LIP6332HNPC). Replace it when your GTK-XB90 no longer holds a charge or shuts down mid-session.
- GTK-XB90 compatibility: The GTK-XB90 uses a multi-cell Li-ion pack at 21.6V nominal to drive both its Class-D amplifier and Bluetooth radio from a single source. This replacement matches that voltage rail and carries the same BMS handshake the speaker's charge controller expects.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on the GTK-XB90 platform. The BMS responded correctly to charge termination, cell balancing, and over-discharge cutoff without triggering fault states on the speaker's charge controller.
- Monthly discharge cycle for GTK-XB90 users: Let the speaker run down below 20% at least once a month before recharging. The GTK-XB90 is often kept plugged in between events — constant top-off charging without a full discharge causes fuel gauge drift and accelerates capacity fade in the Li-ion cells.
Audio distortion before the GTK-XB90 battery indicator reaches empty
As the pack discharges toward its lower voltage threshold, the available current drops. The GTK-XB90's amplifier draws significant current at high volume, and when pack voltage sags under that load, the amp clips before the fuel gauge registers empty. The battery indicator reflects resting voltage, not loaded voltage — so the gauge can show two bars while the amplifier is already starved. If distortion appears consistently at the same volume level late in a session, the pack is sagging below roughly 18V under load and needs replacement.
GTK-XB90 warm to the touch during extended play sessions
The GTK-XB90 houses the battery directly beneath the amplifier stage inside a sealed fabric-wrapped enclosure. Heat from the amp and heat from the discharging Li-ion cells combine in a space with limited airflow. Mild warmth is normal, but if the cabinet becomes hot enough to feel uncomfortable through the fabric, the BMS thermal protection may throttle output or trigger a shutdown before the pack is empty. Keep the speaker off soft surfaces like sofas or carpets during long sessions — hard flat surfaces allow the base vents to breathe and reduce thermal buildup inside the housing.