Akai EWI 5000 Replacement Battery 3.7V 3400mAh

Akai EWI 5000 / 5000 Solo — 3.7V Li-ion Replacement Battery (1ABTUR18650ZY01)

This is a 3.7V, 3400mAh Li-ion cell for the Akai EWI 5000 and EWI 5000 Solo wind synthesizer. It replaces OEM part 1ABTUR18650ZY01, which powers the instrument's sound processing board and wireless transmission module. Swap it when your EWI 5000 loses charge quickly, fails to power on, or drops the wireless signal mid-performance.

• EWI 5000 and 5000 Solo compatibility: Both models use the same 3.7V single-cell architecture with identical connector pinout and BMS handshake protocol. One battery covers both instruments without modification.
• Bench tested on actual hardware: We cycled this cell through the EWI 5000's full load — sound engine active, wireless transmitter broadcasting — and monitored BMS cutoff thresholds. The protection circuit triggered cleanly at the low-voltage floor without nuisance trips during normal use.
• Wireless transmitter draw: The EWI 5000's onboard wireless module runs continuously while the instrument is powered on. Keep the wireless antenna connection secure at the board — a loose antenna forces the transmitter to boost output power, which increases current draw from the cell and accelerates discharge between charges.

Why the EWI 5000 drops wireless signal before the battery reads empty

The EWI 5000's wireless transmitter is the highest-current load on this 3.7V cell. As the cell discharges toward its lower voltage range, the transmitter experiences voltage sag — a temporary drop below the radio module's minimum operating voltage — before the battery indicator registers critical. This causes the wireless link to drop or stutter while the instrument itself still appears powered. A fresh cell with full capacity holds voltage more firmly under this load, reducing sag events. If signal drops persist on a new battery, check that the instrument's wireless channel is not crowded — RF interference forces the transmitter to renegotiate, drawing burst current from the cell.

EWI 5000 powers on but shuts off within seconds of enabling wireless

This is a BMS protection trip, not a firmware fault. When the wireless module initialises, it draws a start-up current spike that an aged or deeply discharged cell cannot sustain — the BMS reads an overcurrent event and cuts output to protect the cell. The instrument shuts off immediately. Charge the replacement battery fully before first use — the cell needs to reach 4.2V so the BMS has headroom above the trip threshold during that initialisation spike. If the shutdown repeats on a fully charged new cell, inspect the battery connector pins for corrosion, as increased contact resistance amplifies the apparent load at the BMS sensor.