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Sony Clie PEG-TJ25 Replacement Battery 3.7V 900mAh

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From $23.99 USD $29.99
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Fits Sony Clie PEG-TJ25 and PEG-TJ35 organizers; replaces OEM part number PL-383450.
3.7V 900mAh lithium-polymer cell delivers the voltage and capacity this PDA requires for full scheduling, contact, and application functionality.
Connector slides straight into the battery slot with a single locking tab; orientation is fixed by the slot geometry.
We bench-tested this cell in a PEG-TJ25 unit; the BMS initialized on first charge with no fault codes or cutoff events.
Sync all data to your host computer before removing the original battery — the PDA stores open files and application state in RAM powered solely by this cell, and full power loss erases unsaved work.
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

900mAh

Sony Clie PEG-TJ25 / PEG-TJ35 — 3.7V Li-Polymer Replacement Battery (PL-383450)

This is a 3.7V 900mAh lithium-polymer battery for the Sony Clie PEG-TJ25 and PEG-TJ35 personal digital assistants. It replaces OEM part PL-383450 — a slim pouch cell measuring 61.70 × 35.07 × 3.96mm. When the original cell degrades and your Clie drops off after light use, this restores full operating capacity.

  • PEG-TJ25 and PEG-TJ35 compatibility: Both units share the same battery bay dimensions, connector pinout, and charge management circuit. One cell covers either device without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the Clie platform and confirmed the BMS accepted charge handshake correctly, held voltage through normal PDA load, and showed no abnormal cutoff events.
  • Sync before you swap: The Clie PEG-TJ25 holds open application state, contacts, and calendar data in volatile RAM powered directly by this cell. Removing the battery without first syncing to your host computer via HotSync will erase unsaved data. Complete a full HotSync before pulling the old cell.

Why the Clie PEG-TJ25 loses all data on battery removal

Unlike flash-based devices, the Clie PEG-TJ25 uses battery-backed SRAM to store the entire application database — contacts, memos, schedules, and installed apps. When the main cell is removed, even briefly, SRAM loses power and all data is wiped. There is no background flash write cycle protecting it. Before swapping this battery, run HotSync to push the full database to your PC, then swap the cell and restore.

Clie PEG-TJ25 stuck on startup screen after new battery installed

A freshly shipped lithium-polymer cell often sits at or below 3.2V after storage. The Clie boot sequence checks for a minimum voltage threshold before completing the Palm OS initialisation — if voltage is too low, the device stalls at the startup logo or immediately powers off. Do not attempt repeated resets at this point. Connect the Clie to its charger and allow at least 15–20 minutes of charge before attempting to power on. Once the cell climbs above 3.5V, the boot sequence completes normally.

Compatible Models

Clie PEG-TJ25 Clie PEG-TJ35

Replaces Part Numbers

PL-383450

Technical Specifications

Voltage3.7V
Amp Hours900mAh
Capacity900mAh
Rate3.33Wh
Net Weight17g /0.60 oz
Gross Weight42g /1.48 oz
Approximate Weight42g /1.48 oz
Dimension 61.70 x 35.07 x 3.96mm

Product Highlights

  • Brand: Sony
  • 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 Clie PEG-TJ25 wiped everything when I swapped the battery — is the data gone for good?

Yes, if no sync was done beforehand. The PEG-TJ25 stores its entire database — contacts, calendar, memos, apps — in SRAM that loses power the moment the cell is removed. There is no onboard flash fallback. If you have a prior HotSync backup on your PC, restore it immediately using Palm Desktop; the device will rebuild from that backup on the next sync.

The Clie PEG-TJ25 drains the new battery noticeably faster when using the wireless add-on — is something wrong with the cell?

Nothing is wrong with the cell. The 802.11b or Bluetooth module on the Clie draws significantly more current than standby or basic PDA tasks — far beyond what the baseline 900mAh rating assumes. This accelerates voltage drop per cycle. Reduce wireless sync intervals, disable the radio when not actively syncing, and charge the device fully before each wireless session to keep voltage in the upper range where the radio operates cleanly.

HotSync over USB keeps dropping or failing since I installed the new battery — what's causing it?

The Clie's USB controller is voltage-sensitive. If the replacement cell shipped below 3.4V, the USB stack can lose enumeration mid-transfer, causing HotSync to abort. Charge the device fully before attempting a sync — a cell sitting above 3.6V sustains clean USB communication throughout the session. If drops continue after a full charge, check the cradle contacts for oxidation and reseat the device firmly before retrying.

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