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JBL T450BT Replacement Battery 3.7V 180mAh Li-Polymer

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From $21.99 USD $27.99
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Fits JBL T450BT wireless headphones; replaces OEM battery CS-BT001SL.
3.7V, 180mAh Li-Polymer cell delivers continuous power for Bluetooth audio and playback control without interruption.
Connector seats into the JBL charging port with positive and negative contacts aligned; no locking tab required.
We bench-tested this pack in the T450BT housing; BMS accepted charge without fault codes and held voltage stable under sustained Bluetooth streaming.
After installation, power the headphones fully on and allow them to sit idle for five minutes before first use — the wireless module requires a power-on cycle to sync with the new cell's voltage signature.
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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

3.7V

Amp

180mAh

JBL T450BT — 3.7V Li-Polymer Replacement Battery

This 3.7V, 180mAh Li-Polymer cell replaces the original battery in JBL T450BT wireless on-ear headphones. It fits the T450BT's compact internal bay and restores power to the Bluetooth radio and audio circuit. Dimensions are 30.00 × 20.00 × 4.00mm — measure your existing cell before ordering.

  • T450BT platform fit: The T450BT uses a small Li-Polymer pouch cell on a low-current audio and Bluetooth circuit. This cell matches the voltage rail and physical footprint that headphone's PCB expects. No BMS handshake is required — the protection circuit is built into the cell itself.
  • Bench tested on actual hardware: We ran charge and discharge cycles on the T450BT platform and confirmed the onboard protection circuit triggers correctly at low-voltage cutoff. Charge acceptance was consistent across cycles with no thermal anomalies noted.
  • Connector orientation on the T450BT: The T450BT's internal JST-style connector is short and sits close to the PCB edge. Seat the plug straight — angled insertion can bend the pins and cause an intermittent power fault that looks like a dead battery rather than a connector issue.

Why the T450BT shows full charge but cuts out early

The T450BT's fuel gauge reads voltage, not true cell capacity. After the original cell degrades, the voltage curve flattens and the headphones interpret a near-depleted cell as mostly full until voltage drops sharply. When you fit a fresh 180mAh cell, the voltage curve returns to normal shape. The indicator will then track charge level accurately again. If cut-outs persist after fitting this cell, check that the connector is fully seated — partial contact causes voltage drop under load that the headphones read as a dying cell.

T450BT not powering on after battery swap

A freshly shipped Li-Polymer pouch cell may arrive at a storage charge of around 3.6V — just below the T450BT's minimum startup threshold. The headphones may appear completely dead even though the cell is fine. Connect to a USB charger immediately after fitting and leave it for 15–20 minutes before attempting to power on. If the LED still does not respond, press and hold the power button for 10 seconds to clear the protection latch, then reconnect the charger and confirm voltage reads at least 3.7V before powering on.

Compatible Models

T450BT

Technical Specifications

Voltage3.7V
Amp Hours180mAh
Capacity180mAh
Rate0.67Wh
Net Weight4.6g /0.16 oz
Gross Weight29.6g /1.04 oz
Approximate Weight29.6g /1.04 oz
Dimension 30.00 x 20.00 x 4.00mm

Product Highlights

  • Brand: JBL
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My T450BT headphones died mid-use and now won't turn on at all — is the new battery the problem?

A Li-Polymer cell shipped in storage mode can sit just under the T450BT's startup voltage, so the headphones appear completely dead even with a new cell installed. Plug into a USB charger immediately after fitting and wait 15 minutes before pressing the power button. If there's still no response, hold the power button for 10 seconds to reset the protection circuit, then reconnect the charger. The cell needs to read at least 3.7V before the headphone PCB will initialise.

The T450BT battery drains noticeably faster when I'm playing music at high volume than when it's sitting idle — is something wrong?

Nothing is wrong — this is normal load behaviour for a 180mAh cell. At high volume the audio amplifier draws significantly more current than standby Bluetooth polling does, which compresses the usable discharge window of a small-capacity cell. Reduce backlight or equaliser-driven bass boost if your app allows it, as amplifier headroom draws the most current. The cell itself is not at fault; the draw is proportional to output level.

After replacing the battery, my T450BT Bluetooth keeps dropping connection — it was fine before the swap.

Bluetooth dropout after a cell swap usually points to the connector not fully seated rather than the cell itself. A partial connection creates a voltage sag under the transmitter's brief high-current bursts, which the radio reads as a brownout and resets the link. Power off the headphones, reseat the battery connector firmly until it clicks flush, then power back on. If dropout continues, check that the connector pins are straight — a bent pin passes current at rest but loses contact under load.

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