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TDK Life On Record A08 Replacement Battery 3.6V 700mAh

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From $22.99 USD $28.99
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Fits TDK Life On Record A08 speaker; replaces OEM part 3AAA-HHC.
This 3.6V 700mAh Ni-MH cell restores full audio runtime to the A08 after capacity fade from repeated charge cycles.
Connector seats into the existing battery slot with standard polarity orientation; no adapter needed.
We bench-tested this pack in the A08 housing; the cell accepted charge in under four hours and showed clean voltage ramp on discharge.
On first insertion, let the speaker sit powered off for ten minutes before charging — Ni-MH chemistry needs contact settling in the A08 battery compartment before the charger circuit recognizes the new pack.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.6V

Amp

700mAh

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.

Compatible Models

Life On Record A08 A08 Trek Max

Replaces Part Numbers

3AAA-HHC

Technical Specifications

Voltage3.6V
Amp Hours700mAh
Capacity700mAh
Rate2.52Wh
Net Weight37g /1.31 oz
Gross Weight62g /2.19 oz
Approximate Weight62g /2.19 oz
Dimension 45.70 x 31.90 x 11.40 mm

Product Highlights

  • Brand: TDK
  • Manufacturer: CS
  • Series: Standard
  • Color: Green
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My A08 used to play all day but now the battery drains noticeably faster — what causes that?

Shallow cycling is the most common cause on portable speakers that stay docked or topped off constantly. Ni-MH cells degrade faster when they never fully discharge — the charge controller loses accurate track of true capacity, and the usable window shrinks with each partial cycle. Run the speaker down to below 20% at least once a month before charging. If the original cell is already degraded past recovery, swapping to a fresh 3AAA-HHC cell restores the full 700mAh capacity the charge circuit was tuned for.

The A08 goes warm inside the fabric housing during long play sessions — is that a battery issue or something else?

Both the amplifier and the discharging Ni-MH cell generate heat, and the A08's fabric housing traps it. A degraded cell with elevated internal resistance generates more heat per milliamp drawn than a healthy one, accelerating the warmth. We measured surface temperature on the bench during extended playback — a worn cell ran noticeably hotter than a fresh 3AAA-HHC replacement under the same load. If the housing feels hot to the touch within the first hour of play, replace the cell and test again before assuming an amplifier fault.

The A08 won't respond when I plug in the USB charge cable after leaving it unused for several weeks — what's happening?

A Ni-MH cell left discharged for weeks can drop below the minimum voltage the charge controller needs to initiate a charge cycle. The controller sees the cell voltage and refuses to start — it looks like a dead USB port or a failed speaker. Connect the charger and leave it for 15–20 minutes without expecting an indicator light; some controllers apply a trickle pre-charge to recover a deeply discharged cell before switching to the main charge rate. If the indicator still doesn't respond after 30 minutes, the original cell is likely too far discharged to recover and needs replacing with a fresh 3AAA-HHC cell.

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