Yamaha NX-P100 Replacement Battery YBP-L01 3.7V 2600mAh

Yamaha NX-P100 — 3.7V Li-ion Replacement Battery (YBP-L01)

This is a 3.7V Li-ion replacement battery for the Yamaha NX-P100 portable Bluetooth speaker. It carries a 2600mAh (9.62Wh) capacity and slots into the same position as the original YBP-L01 cell. If your NX-P100 no longer holds charge or cuts out mid-session, this cell restores it to normal operation.

• NX-P100 compatibility: The NX-P100 uses a single Li-ion cell running at 3.7V nominal to power both the Bluetooth radio and the Class D amplifier from one shared rail. The YBP-L01 matches the original cell's voltage, capacity, and connector pinout — no adapter required.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the NX-P100 platform and confirmed the BMS accepted the pack without fault flags. Charge termination triggered correctly at full voltage, and the protection circuit tripped cleanly at low-cell threshold before the amplifier stage starved.
• Fuel gauge reset after swap: After fitting this cell, run the NX-P100 down to auto-shutoff on first use, then charge uninterrupted to 100%. The speaker's onboard fuel gauge recalibrates to the new cell's capacity curve — skipping this step causes the indicator to read inaccurately for weeks.

Why the NX-P100 audio drops before the battery indicator hits empty

At high playback volume, the Class D amplifier and Bluetooth radio draw simultaneously, spiking current demand sharply. A degraded or shallow-cycled cell can't sustain voltage under that combined load — the cell voltage sags below the amplifier's minimum operating threshold before the fuel gauge registers low. The speaker interprets this as normal operation and doesn't warn you. Fitting a fresh 2600mAh cell raises the sag floor, giving the amplifier enough headroom to reach true low-battery cutoff without clipping first.

NX-P100 won't wake from USB charge after sitting unused for months

Li-ion cells self-discharge at roughly 2–3% per month. After several months in storage, the NX-P100's cell can drop below the USB-C acceptance threshold — the charger sees a pack voltage it won't engage with, so the speaker appears completely dead. Some units recover with a bench supply trickle at 3.0V for 10–15 minutes to bring the cell above the USB-C PD floor, then plug into USB normally. If the cell has dropped below 2.5V and held there for an extended period, recovery is unlikely and replacement is the correct next step.