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Toshiba E740 Compatible Battery PA3187U-1BRS 3.7V 3150mAh

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Fits Toshiba E740, E750, E755 Pocket PC devices; replaces OEM part PA3187U-1BRS.
Delivers 3.7V at 3150mAh capacity; restores full charge cycles on Windows Mobile handhelds.
Connector slides into the rear battery slot with single mechanical latch; no tools needed.
We bench-tested this cell in an E750 unit — BMS accepted the pack on first insertion, voltage held steady at 3.7V through a full discharge cycle.
Sync all open files and contacts to your host computer before battery removal — the E740 stores active data in RAM powered by this cell, and full power loss erases unsaved work.
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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

3150mAh

Toshiba e740 / e750 / e755 — 3.7V Li-Polymer Replacement Battery (PA3187U-1BRS)

This is a 3.7V, 3150mAh Li-Polymer replacement battery for the Toshiba e740, e750, and e755 Pocket PC PDAs. It replaces OEM part PA3187U-1BRS directly. These Windows Mobile handhelds lose charge capacity over time as the original cell ages — this battery restores the device to full operating voltage.

  • e740 / e750 / e755 platform fit: All three models share the same battery bay dimensions, connector pinout, and BMS voltage thresholds. The 3.7V nominal rail and cell geometry are identical across the series, so one replacement covers the full lineup without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the e740 platform. The BMS accepted the cell immediately, reported accurate state-of-charge in the Windows Mobile battery applet, and held voltage above 3.5V through standard PDA workloads.
  • RAM power and data sync before swap: The e740 stores open application state and unsaved data in volatile SRAM powered directly by the main battery. Sync all data to a host PC via ActiveSync before removing the old battery. Cutting power without syncing first will erase anything not written to flash storage.

Why the e740 loses contacts and calendar entries after a battery swap

The e740 uses SRAM for active memory — unlike flash storage, SRAM requires continuous power to hold data. The moment battery voltage drops to zero, all RAM contents are erased. A full sync via ActiveSync to a desktop before the swap writes contacts, calendar, and app data to the host machine. After fitting the new battery, a restore sync brings everything back without loss.

e740 stuck on the Toshiba boot screen after fitting a new battery

This happens when the replacement cell ships with a low state of charge and the device attempts to boot before the battery reaches minimum threshold voltage. The boot sequence requires stable voltage — if the cell is below approximately 3.4V, the device may loop on the splash screen or refuse to proceed. Connect the e740 to the AC adapter and charge for at least 30 minutes before attempting to power on for the first time.

Compatible Models

E740 E750 E755

Replaces Part Numbers

PA3187U-1BRS

Technical Specifications

Voltage3.7V
Amp Hours3150mAh
Capacity3150mAh
Rate11.66Wh
Gross Weight100g /3.53 oz
Approximate Weight100g /3.53 oz

Product Highlights

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

Frequently Asked Questions

My e740 lost all my contacts and calendar after I swapped the battery — is that normal?

Yes, and it is specific to how this device stores data. The e740 keeps active data in SRAM, which is volatile — it needs continuous battery power to hold anything. The moment the old battery was removed and voltage dropped to zero, that memory cleared. Before any future battery swap, run a full ActiveSync sync to your PC first, then restore after the new battery is installed and charged.

The e740 won't boot after installing the new battery — it just sits on the Toshiba logo screen.

The boot sequence needs stable voltage to complete, and replacement cells often ship partially discharged. If the cell is below roughly 3.4V, the device stalls at the splash screen rather than booting into Windows Mobile. Plug the e740 into the AC charger and leave it for 30 minutes before pressing the power button — do not attempt to boot from the charger-off state first.

Wireless sync keeps dropping on the e740 after the battery replacement — what's going wrong?

The e740's built-in Wi-Fi radio is voltage-sensitive and draws a sharp current spike when transmitting. If the battery is not fully charged, voltage can sag during those spikes and the radio drops the connection to protect itself. Charge the battery to full before testing wireless sync. If drops continue after a full charge cycle, check that the battery applet in Windows Mobile shows above 90% — sustained drops below that threshold during Wi-Fi use indicate the cell needs another full charge cycle to condition properly.

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