Sony GTK-XB60 Replacement Battery 14.8V 2600mAh Li-ion

Sony GTK-XB60 — 14.8V Li-ion Replacement Battery (1-853-678-11)

This is a 14.8V, 2600mAh Li-ion battery for the Sony GTK-XB60 portable Bluetooth speaker. It replaces OEM part numbers 1-853-678-11 and LIP4160HEPC. Fit the GTK-XB60 specifically — this pack is not a universal speaker battery.

• GTK-XB60 battery platform: The GTK-XB60 runs a four-cell Li-ion configuration at 14.8V nominal to supply both the Class D amplifier rail and the Bluetooth radio simultaneously. The BMS monitors individual cell balance and will hard-cut output if any cell drifts more than 150mV from the pack average — a known behaviour on this speaker family under high-volume load.
• Bench tested on actual hardware: We cycled this pack through repeated charge and discharge passes on a GTK-XB60 unit. The BMS handshake cleared on first connection, cell balancing completed within the first full charge, and the protection circuit responded correctly to simulated over-current spikes matching amplifier start-up draw.
• Monthly discharge cycle for GTK-XB60: This speaker typically charges on a desk or shelf and rarely drains below 50%. Run it down past 20% at least once a month before recharging. Without a full discharge cycle, the fuel gauge drifts and the speaker reports full charge while actual cell capacity quietly shrinks.

Audio distortion before the battery indicator reaches empty on the GTK-XB60

The GTK-XB60 amplifier needs a stable supply above approximately 12V to drive clean output at high volume. As a degraded or partially discharged pack sags under combined amplifier and radio current draw, the supply rail drops below that threshold before the battery gauge reads low. The amplifier clips because the voltage is insufficient, not because the speaker is faulty. Fitting a fresh 14.8V pack with healthy cell balance restores the clean supply the amplifier needs and pushes that clipping point back toward actual low-charge territory.

GTK-XB60 showing full charge on indicator but audio cutting out after extended play

This is fuel gauge drift caused by shallow cycling — the speaker was repeatedly topped off before reaching a genuine low state, so the BMS lost its calibrated reference points for full and empty. The indicator reads full because the BMS last learned "full" at a degraded capacity ceiling. Run the battery down past 20% then charge uninterrupted to 100% to force the BMS to relearn both endpoints. After two or three full cycles the indicator should track actual charge state accurately again.