About this replacement
TDK Life On Record A08 / Trek Max — 3.6V Ni-MH Replacement Battery (3AAA-HHC)
This is a 3.6V 700mAh Ni-MH replacement battery for the TDK Life On Record A08 and Trek Max portable Bluetooth speakers. It matches the OEM part number 3AAA-HHC and fits the physical battery bay without modification. Capacity is rated at 2.52Wh, identical to the original cell specification.
- A08 and Trek Max platform fit: Both models share the same 3.6V single-cell Ni-MH architecture, connector pinout, and physical footprint — 45.70 × 31.90 × 11.40 mm. Same battery bay, same charge circuit, same part.
- Bench tested on actual hardware: We cycled this cell through the A08's onboard charge controller and confirmed the charge termination responded correctly at full capacity. The protection circuit tripped cleanly under a deliberate over-discharge test, with no thermal anomaly during recharge.
- Ni-MH cycle discipline on the A08: The A08's charge circuit is calibrated for Ni-MH delta-V termination. Constant top-off charging without a full discharge at least once a month causes fuel gauge drift — the indicator reads full but actual capacity has declined. Run the speaker to below 20% once a month before recharging.
Why the A08 plays loud for a short time then cuts to low volume on a replacement cell
The A08's amplifier draws a current spike at high volume that the speaker's onboard protection circuit monitors against. A cell with internal resistance higher than the original spec causes voltage to sag sharply under that spike. The firmware interprets the sag as a low-battery event and throttles output to protect the cell. A fresh 3AAA-HHC cell with correct internal resistance holds the voltage rail steady under amp load, preventing premature throttling.
Audio distorting before the battery indicator reaches empty
On the A08, distortion before the low-battery warning usually means the cell's voltage is sagging under amplifier draw faster than the indicator updates. The indicator samples voltage at rest; the amplifier pulls current in bursts that the display doesn't capture. Measure the battery voltage under load with a multimeter — if it drops below 3.0V during playback, the cell is failing. Replace the cell and recheck; a healthy 3AAA-HHC cell should hold above 3.2V under normal playback draw.