Bose SoundSport Wireless Compatible Battery CP1654 3.7V 60mAh

Bose SoundSport Wireless — 3.7V Li-ion Replacement Battery (CP1654)

This is a 3.7V, 60mAh Li-ion cell sized for the Bose SoundSport Wireless and SoundSport Pulse earbuds. It replaces the original CP1654 (also listed as LIR1654) coin-format cell inside each earbud housing. Use this when your earbuds no longer hold a charge or cut off shortly after unplugging from the case.

• SoundSport Wireless and SoundSport Pulse fit: Both models use the same 16.20 × 16.20 × 6.06mm round cell with a 3.7V nominal rail. The BMS inside each earbud expects this exact cell geometry and voltage curve — swapping a different cell size triggers an immediate cutoff.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the SoundSport Wireless platform. The BMS completed its handshake without error flags, and the cell held within spec voltage at both full charge and low-battery cutoff.
• First-charge protocol for this earbud: After fitting, place the earbud in the charging case and run a full charge cycle before use. The SoundSport BMS logs the new cell during this cycle — skipping it causes the battery indicator to read inaccurately for the first several sessions.

Why SoundSport Wireless earbuds cut out mid-playback on a new battery

The SoundSport Wireless draws simultaneously from the audio driver and the Bluetooth radio — two loads sharing one 60mAh cell. Under combined draw, a cell that hasn't completed its first full cycle can sag below the BMS cutoff threshold, causing an abrupt shutdown even when the indicator shows charge remaining. This isn't a faulty cell — it's the BMS protecting against under-voltage before the cell has been conditioned. Run two to three full charge-discharge cycles and the sag behaviour stabilises.

Talk time shorter than expected across the first few uses

A fresh Li-ion cell doesn't reach full capacity on its first cycle — it typically takes three to five full cycles to reach rated capacity. On a 60mAh cell, even a 10–15% shortfall is noticeable in back-to-back listening sessions. The fix is straightforward: drain the earbud to the auto-shutoff point, then charge fully in the case. Repeat this three times and capacity should reach its rated level, with the low-battery indicator triggering closer to 3.0V as intended.