About this replacement
TDK Life On Record A26 — 3.6V Ni-MH Replacement Battery
This is a 3.6V, 700mAh Ni-MH replacement battery for the TDK Life On Record A26 portable speaker. It slots in place of the original cell to restore wireless audio playback on a speaker that has lost charge capacity or stopped holding a charge altogether. Capacity figure is 2.52Wh, matching the original spec.
- Life On Record A26 fit: The A26 runs a single Ni-MH cell at 3.6V to power both the amplifier board and the Bluetooth radio. Swapping in a cell at the wrong voltage or chemistry causes the protection circuit to reject the pack at first charge — this cell matches both parameters exactly.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the A26 platform and confirmed the BMS accepted the pack without fault flags, and the Bluetooth radio and amplifier drew cleanly without triggering undervoltage cutoff.
- Ni-MH cycle care for the A26: Ni-MH cells in always-on desk speakers develop voltage depression when repeatedly charged from high state of charge. Let the A26 run down past the low-battery indicator at least once a month before plugging it in — this keeps cell voltage calibrated and slows capacity fade.
Audio distorting before the battery indicator reaches empty on the A26
The A26 amplifier needs a stable voltage rail to drive the speaker cleanly. As the Ni-MH cell ages and internal resistance rises, voltage sags under the combined draw of the amplifier and Bluetooth radio before the fuel gauge registers empty. The amplifier clips when the rail drops below its minimum operating voltage, producing audible distortion — even though the indicator still shows charge remaining. Replacing the cell eliminates the sag and restores clean output at full volume.
A26 Bluetooth dropping specifically at high volume, not at low volume
High-volume playback forces the amplifier to draw peak current at the same moment the Bluetooth radio is transmitting, creating a combined current spike the aging cell cannot sustain without a voltage dip. The Bluetooth module has a lower minimum operating voltage than the amplifier, so it loses signal first while audio continues briefly. The cell is the cause — not the radio or antenna. A fresh 700mAh cell at full charge holds voltage through those combined spikes and keeps the radio link stable.