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JBL Free Charging Case Compatible Battery GSP803450 3.7V 1350mAh

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Fits JBL Free and Free X charging cases; replaces OEM battery GSP803450 01.
3.7V, 1350mAh lithium-polymer cell restores full charge cycles to the case dock.
Connector slots vertically into the case battery compartment without locking tabs required.
We tested the GSP803450 01 on bench load; BMS accepted charge current without fault delay.
On first insertion, let the case charge for one full cycle before pairing earbuds — the dock needs to log the new cell's voltage profile.
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.

Disclaimer

⚠️ 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

1350mAh

JBL Free Charging Case — 3.7V Li-Polymer Replacement Battery (GSP803450 01)

This is a 3.7V, 1350mAh Li-Polymer replacement battery for the JBL Free Charging Case and JBL Free X TWS Charging Case. It fits directly inside the case housing and powers the internal cell that recharges the earbuds between wall top-ups. When the original cell degrades, the case stops holding enough charge to complete even one full earbud cycle — swapping this battery restores that function.

  • Free and Free X TWS Case compatibility: Both the JBL Free and Free X TWS charging cases use the same GSP803450 01 cell with the same connector and footprint. The BMS in both cases communicates with this cell the same way, so no firmware or hardware change is needed when swapping.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the case PCB and confirmed the BMS accepted the pack, reported charge status correctly, and passed current to the earbud contacts without interruption.
  • Case reconditioning after swap: After fitting this battery, run the case from flat to full on wall power before placing the earbuds inside. This lets the case BMS calibrate its charge gauge against the new cell's actual capacity — skipping this step can cause the LED indicators to misread the charge level for the first several cycles.

Why the JBL Free Case LED shows full but the earbuds die after short use

The case stores its charge estimate in firmware based on the original cell's behaviour. When the internal cell degrades heavily, the BMS can still show a full charge state while the actual deliverable capacity has dropped significantly. A new replacement cell won't fix the LED mismatch immediately — the case needs two or three full charge-discharge cycles before the firmware recalibrates to the new cell's real output. After those cycles, the LED indicators should track accurately again.

Case gets warm during charging but earbuds won't reach full charge

This usually means the original cell has an elevated internal resistance, drawing more current as heat rather than storing it. The case PCB still drives charge current, but most of it dissipates before reaching the earbud contacts at useful voltage. Replacing the cell removes the high-resistance load. After fitting the new battery, confirm the case output voltage at the earbud contacts reads between 4.1V and 4.2V during active charging — anything below 3.9V points to a contact or connector issue rather than the cell itself.

Compatible Models

Free Charging Case Free X TWS Charging Case

Replaces Part Numbers

GSP803450 01

Technical Specifications

Voltage3.7V
Amp Hours1350mAh
Capacity1350mAh
Rate5Wh
Net Weight26.5g /0.93 oz
Gross Weight51.5g /1.82 oz
Approximate Weight51.5g /1.82 oz
Dimension 51.10 x 33.70 x 7.60mm

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 JBL Free case shows a solid charge light but the earbuds cut off after a few songs — is that the case battery dying?

Yes, that pattern points directly to a degraded case cell. The BMS holds onto its old charge map and reports full even when the actual deliverable capacity has dropped well below what one full earbud cycle needs. Fit the replacement cell and run two full charge-discharge cycles on the case before using the earbuds. After the second cycle the LED should track the real charge state accurately.

I replaced the battery in my JBL Free Charging Case but the case isn't charging the earbuds at all — the contacts feel fine.

The most common cause after a cell swap is an incomplete BMS handshake — the case PCB hasn't yet recognised the new cell as a valid pack. Place the case on wall power with the earbuds out and leave it for a full charge cycle without interruption. This forces the BMS through its initialisation sequence. If the earbuds still don't charge after that, check that the cell connector is fully seated — a partially engaged connector passes enough voltage to wake the BMS but not enough to drive the output contacts.

The JBL Free case feels noticeably warm on the outside even when it's just sitting on the charger — is that normal with a new battery?

Some warmth during the first charge is normal as the new cell conditions, but sustained external warmth on a case that's just sitting idle points to elevated current draw through a high-resistance connection. Check that the replacement cell's connector is fully clicked in and that no solder points on the PCB are bridged. Once the cell is properly seated, surface temperature during a normal charge cycle should stay close to ambient. If it stays warm after two full cycles, measure the cell voltage at rest — it should read between 4.1V and 4.2V at full charge.

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