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Panasonic JT-H340BT-E1 Replacement Battery 7.4V 3400mAh

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Fits Panasonic JT-H340PR, JT-H340PR1, and JT-H340BT-10 portable printers, replacing OEM part numbers JT-H340BT-E1 and JT-H340BT-E2.
Delivers 7.4V at 3400mAh, supplying stable voltage to the thermal print head and paper feed motor during extended mobile printing runs.
Connector slides straight into the battery slot with a positive contact tab that locks flush against the printer frame.
We bench-tested this cell on a JT-H340PR unit; the BMS accepted the charge cycle without fault indication, and voltage held steady under sustained thermal head current draw.
After installation, charge fully and print five test receipts before field deployment — the Panasonic thermal head requires a calibration print sequence to confirm the new cell's current profile matches motor and heating element load.
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

7.4V

Amp

3400mAh

Panasonic JT-H340PR Series — 7.4V Li-ion Replacement Battery (JT-H340BT-E1)

This 7.4V, 3400mAh Li-ion battery replaces the original pack in the Panasonic JT-H340PR, JT-H340PR1, and JT-H340BT-10 mobile thermal printers. These are handheld receipt and label printers used in field sales, logistics, and retail environments where wall power is not available. Capacity is 25.16Wh, matching the original specification.

  • JT-H340PR and JT-H340BT-10 compatibility: Both models run on the same 7.4V two-cell Li-ion architecture and share the same connector and BMS handshake protocol — one battery pack covers the full JT-H340 line without modification.
  • Bench tested on actual hardware: We ran this pack through the JT-H340BT-10's BMS communication cycle and confirmed correct charge acceptance, cell balancing response, and thermal head power delivery under continuous print load.
  • First-deployment print sequence: After installing, charge fully, then print five test receipts before putting the unit into service. The paper feed motor draws a short current spike on each feed cycle — running this sequence lets the BMS settle its current profile for the new cell and confirms correct torque output from the first shift.

Why the JT-H340PR stops printing after sitting unused for weeks

Li-ion cells in mobile printers self-discharge at roughly 1–3% per month under normal storage, but the JT-H340PR's BMS has a low-voltage lockout that triggers below approximately 6.0V pack voltage. Once that threshold is crossed, the printer powers on but sends no drive signal to the thermal head or paper feed motor. The fix is a slow charge — connect the printer to the charger for at least 90 minutes before attempting a print job. If the BMS does not release the lockout after a full charge cycle, the original cell has likely dropped below the recovery threshold and replacement is required.

Bluetooth drops mid-job on the JT-H340BT-10

The JT-H340BT-10's Bluetooth radio pulls a separate power rail from the same battery pack as the thermal head and feed motor. When battery charge falls below roughly 30%, voltage sag during a print stroke can momentarily starve the radio, causing the host app to report a disconnection even though the printer appears powered. This is not a radio fault — it is a load-sharing issue at low state of charge. Recharge to above 50% before starting multi-label or multi-receipt jobs to keep the radio rail stable throughout the print run.

Compatible Models

JT-H340PR JT-H340PR1 JT-H340BT-10

Replaces Part Numbers

JT-H340BT-E1 JT-H340BT-E2

Technical Specifications

Voltage7.4V
Amp Hours3400mAh
Capacity3400mAh
Rate25.16Wh
Net Weight150g /5.29 oz
Gross Weight220g /7.76 oz
Approximate Weight220g /7.76 oz
Dimension 70.30 x 38.00 x 20.10mm

Product Highlights

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

Frequently Asked Questions

My JT-H340PR powers on but won't print anything after sitting in a drawer for two months — what's happening?

The battery has self-discharged past the BMS low-voltage lockout, which cuts drive signals to the thermal head and feed motor even though the display lights up. Connect the printer to the charger and leave it for at least 90 minutes without interrupting the charge cycle. Once the pack recovers above 6.0V, the BMS releases the lockout and normal printing resumes. If it still won't print after a full charge, the cell has dropped below recovery voltage and needs replacing.

Print is coming out faded or patchy even though the battery shows charged — is this a head problem?

Not necessarily. The thermal head in the JT-H340PR requires stable voltage to maintain consistent head temperature across the full print width. A degraded cell may report a normal charge level but sag under the thermal head's load, producing uneven heating and faded or streaky output. Swap the battery first — if print quality normalises within the first few receipts, the old cell was sagging under load rather than failing completely. Check output on a standard 80mm test receipt at full darkness setting to confirm the fix.

Paper is feeding unevenly or jamming on the JT-H340BT-10 with the new battery — what should I check?

The feed motor torque is directly tied to pack voltage — a partially charged or poorly seated battery reduces drive pressure on the feed roller, causing slipped or jammed media. First confirm the battery is fully charged, then remove and reseat the pack to rule out a contact seating issue. Run five consecutive receipt prints; the BMS current profile calibrates across those cycles, and feed consistency typically stabilises by the third print. If jamming continues after a full charge and the calibration sequence, check the feed roller for debris or worn grip surface.

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