Skullcandy Crusher Evo FT112931P Replacement Battery 3.8V 1200mAh

Skullcandy Crusher Evo — 3.8V Li-Polymer Replacement Battery (FT112931P)

This 3.8V, 1200mAh Li-Polymer cell replaces the original FT112931P battery in the Skullcandy Crusher Evo wireless headphones. It restores audio playback and the haptic bass function when the original cell can no longer hold charge. Capacity is 4.56Wh — matching the stock specification.

• Crusher Evo fit: The Crusher Evo runs a single Li-Polymer cell at 3.8V nominal to drive both the audio amplifier and the Sensory Bass haptic driver simultaneously. That dual-draw circuit requires the correct cell footprint — 32.50 x 28.20 x 11.00mm — and a BMS calibrated to the Evo's charge controller. A mismatched cell trips the protection circuit and prevents charging.
• Bench tested on actual hardware: We cycled this cell through the Crusher Evo's charge controller and confirmed BMS handshake, stable cutoff at 4.2V full charge, and low-voltage protection triggering correctly before deep discharge. The haptic bass circuit drew sustained current without triggering false overcurrent cutoff.
• First-cycle calibration on the Crusher Evo: After fitting the new cell, charge to full before powering on the headphones. The Crusher Evo's fuel gauge IC recalibrates its capacity estimate on the first complete charge cycle — skipping this step causes the battery indicator to read inaccurately for several sessions.

Why the Crusher Evo cuts out mid-session with the bass slider engaged

The Sensory Bass haptic driver pulls additional current on top of the audio amplifier draw. When the cell voltage sags under that combined load — typically below 3.4V on a degraded or storage-discharged cell — the BMS trips and cuts power to protect the cell. This looks like a sudden shutdown rather than a gradual power-down. A fresh, fully charged cell holds voltage above the BMS cutoff threshold even under peak haptic draw.

Battery indicator showing full but headphones shut off after short use

A new cell shipped at storage voltage (typically 3.6–3.7V) can cause the Crusher Evo's fuel gauge IC to report an incorrect state-of-charge. The headphones appear fully charged but the usable capacity reads as near-empty after a short session. Run one complete charge cycle — charging uninterrupted until the indicator shows 100% — and the fuel gauge resets its baseline. After that first full cycle, the reported charge level tracks actual capacity correctly.