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Sony Clie PEG-T400 Replacement Battery UP523048 3.7V 850mAh

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From $23.99 USD $29.99
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Fits Sony Clie PEG-T400, PEG-T410, PEG-T425, PEG-T600 and replaces UP523048, LIS1228, 175625411.
3.7V, 850mAh Li-Polymer cell restores full runtime on this PDA's contact, calendar, and document management functions.
Connector seats into the vertical slot behind the device's back panel with a single locking tab engagement.
We bench-tested this cell in a PEG-T400 — BMS accepted charge from standard Sony chargers with no cutoff errors.
Sync all data to your desktop before removing the old battery; the Clie holds open files and settings in RAM powered by this cell alone.
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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

850mAh

Sony Clie PEG-T400 Series — 3.7V Li-Polymer Replacement Battery (UP523048)

This 3.7V, 850mAh Li-Polymer cell replaces the original battery in the Sony Clie PEG-T400, PEG-T410, PEG-T425, and PEG-T600, along with thirteen additional Clie models. It restores power to the device for contacts, calendar, tasks, and document management. Capacity figure is 850mAh / 3.15Wh, matching the original cell specification.

  • Clie T-series compatibility: The PEG-T400, T410, T425, and T600 share the same UP523048 cell footprint, connector pinout, and BMS handshake protocol. One battery covers all four core models without modification.
  • Bench tested on actual hardware: We ran this cell on a PEG-T400 and confirmed the BMS accepted the charge cycle without triggering overcurrent cutoff. The device booted normally and Palm OS loaded without prompting a hard reset.
  • RAM data protection before swap: Perform a full HotSync to your host computer before removing the old battery. The Clie stores open application state and unsaved data in volatile SRAM powered directly by the main cell. Cutting power without syncing first will erase that data permanently.

Why the Clie PEG-T400 loses all data after a battery replacement

The PEG-T400 uses SRAM for active storage, not flash. SRAM is volatile — it requires continuous voltage to retain data. When the old battery is removed and the new one is not yet installed, that voltage drops to zero and the RAM contents are wiped. This is not a fault with the replacement cell; it is a hardware limitation of early 2000s PDA architecture. To avoid data loss, complete a HotSync immediately before the swap so everything is preserved on the host machine.

Clie PEG-T400 stuck on boot screen after new battery installation

A freshly shipped Li-Polymer cell often arrives at a storage charge of around 3.0–3.2V. The PEG-T400 boot sequence requires a minimum voltage threshold to initialise Palm OS; below that, the device stalls on the startup screen or loops. Do not attempt repeated resets — they drain the cell further. Connect to the OEM charger and allow at least 30 minutes of charge before attempting to power on. Once the cell reaches approximately 3.5V, the boot sequence completes normally.

Compatible Models

Clie PEG-T400 Clie PEG-T410 Clie PEG-T425 Clie PEG-T600 Clie PEG-T600C Clie PEG-T615C Clie PEG-T615S Clie PEG-T620 Clie PEG-T625 Clie PEG-T625C Clie PEG-T650 Clie PEG-T650C Clie PEG-T665 Clie PEG-T665C Clie PEG-T675 Clie PEG-T615 Clie PEG-T415

Replaces Part Numbers

UP523048 175625411 LIS1228

Technical Specifications

Voltage3.7V
Amp Hours850mAh
Capacity850mAh
Rate3.15Wh
Net Weight14.2g /0.50 oz
Gross Weight39g /1.38 oz
Approximate Weight39g /1.38 oz
Dimension 48.49 x 30.02 x 4.95mm

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-T400 lost all my contacts and calendar after I swapped the battery — is something wrong with the replacement cell?

Nothing is wrong with the cell. The PEG-T400 holds active data in volatile SRAM, which needs continuous voltage to retain its contents. The moment the old battery was removed, that voltage dropped to zero and RAM was wiped. The replacement battery did not cause the loss — the gap in power did. Going forward, run a full HotSync to your PC before removing the battery so your data is backed up before power is cut.

The Clie PEG-T400 won't boot after fitting the new battery — it just sits on the Sony logo screen.

Li-Polymer cells typically ship at a reduced storage voltage, often around 3.0–3.2V. The PEG-T400 needs more than that to complete its Palm OS boot sequence. Repeated reset attempts make it worse by draining the cell further. Plug the device into the cradle charger and leave it for at least 30 minutes before trying to power on — once the cell reaches roughly 3.5V, the boot sequence will run through.

Battery life on the PEG-T400 is noticeably shorter after just a few months of light use — why is capacity dropping so fast?

Li-Polymer cells in lightly used devices degrade faster when they spend most of their time at either very high or very low states of charge. Leaving the Clie on the cradle continuously keeps the cell pinned near 100%, which accelerates capacity fade. Store and use the device with the battery between roughly 40–80% charge when it will sit unused for more than a week. If the cell is already showing significant fade, a full discharge down to the low-battery warning followed by a complete charge cycle can help the BMS recalibrate its capacity reading.

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