About this replacement
TDK Life On Record A12 — 3.6V Ni-MH Replacement Battery (AAA BPI AAA600mAh)
This is a 3.6V, 700mAh Ni-MH replacement battery for the TDK Life On Record A12 portable speaker. It slots into the A12's internal battery bay and restores wireless audio playback after the original cell degrades or fails. Dimensions are 45.90 × 22.10 × 20.10mm — verify against your existing cell before ordering.
- Life On Record A12 fitment: The A12 runs a single AAA-format Ni-MH pack at 3.6V. This cell matches that voltage rail and physical envelope, so the speaker's charging circuit and low-battery cutoff behave as expected.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the A12 platform. The speaker's protection circuit accepted the cell without fault, and the low-voltage cutoff triggered cleanly at the correct threshold.
- Ni-MH top-off cycling on the A12: Ni-MH cells in always-docked speakers develop memory effect faster than Li-ion. Run the A12 down past 20% at least once a month before putting it back on charge — this keeps the cell's usable capacity from drifting below the speaker's low-battery threshold prematurely.
Audio distortion on the A12 before the battery indicator reaches empty
As a Ni-MH cell ages, its internal resistance rises. Under the combined current draw of the amplifier and Bluetooth radio at mid-to-high volume, terminal voltage sags below what the amplifier needs to swing cleanly. The result is clipping distortion well before the fuel gauge reads low. Replacing the cell eliminates the sag — a fresh 700mAh cell at 3.6V holds terminal voltage steady under that combined load.
A12 shows full charge on a new battery but audio cuts out after extended play
This happens when a deeply discharged or heavily cycled cell has lost usable capacity — the fuel gauge reads full off a surface charge but the actual storable energy is a fraction of 700mAh. The speaker hits its undervoltage cutoff much earlier than expected, killing audio abruptly. Confirm the issue by checking whether the speaker body feels warm near the battery bay after cutoff — heat build-up from a struggling cell is a reliable indicator. Fitting a replacement cell and running one full discharge cycle from 100% to cutoff resets the gauge baseline.