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Toshiba Genio E550G Compatible Battery CET0301A 3.7V 1200mAh

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Fits Toshiba Genio E550G PDA — replaces OEM battery CET0301A.
3.7V, 1200mAh Li-Polymer cell restores full capacity to this handheld after aging damage.
Connector and locking tab match the original CET0301A — no modification needed.
We bench-tested this cell in a Genio E550G boot cycle; the BMS stabilized at 3.7V within two charge cycles.
Sync all open PDA files to your host computer before removing the old battery — the E550G stores active RAM data on main power, and full cell removal erases unsaved settings and cached records.
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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

3.7V

Amp

1200mAh

Toshiba Genio E550G — 3.7V Li-Polymer Replacement Battery (CET0301A)

This is a 3.7V, 1200mAh Li-Polymer replacement battery for the Toshiba Genio E550G PDA. It fits directly in place of OEM part CET0301A. The cell powers the processor, display, and wireless radio on this Pocket PC platform.

  • Genio E550G platform fit: The E550G uses a flat Li-Polymer cell with a specific connector orientation and BMS handshake tied to the CET0301A part number. This replacement matches that BMS profile, voltage rail, and physical form factor so the device recognises the battery on insertion.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the E550G platform. The BMS held a stable 3.7V nominal rail, engaged charge cutoff cleanly at 4.2V, and did not trigger low-voltage lockout during boot.
  • RAM preservation before swap: Sync all open data to the host PC before removing the battery. The Genio E550G holds active application state and open files in SRAM powered directly by the main cell — a full power loss wipes that data instantly with no recovery path.

Why the Genio E550G goes blank mid-session without warning

Aged Li-Polymer cells develop high internal resistance over charge cycles. Under the combined draw of the display backlight and wireless radio, a degraded cell can drop below the BMS cutoff threshold instantly — even if the charge indicator showed 30–40% moments earlier. The voltage collapse happens faster than the fuel gauge can update. A new cell at full charge holds the rail stable across that combined load.

Genio E550G not booting after new battery installed

A fresh Li-Polymer cell shipped in storage mode can sit below the minimum boot voltage the E550G requires to complete its POST sequence. If the device shows nothing on screen or cycles off immediately after pressing power, the cell has not yet reached operational voltage. Connect the OEM charger and leave the unit on charge for at least 30 minutes before attempting to power on. The BMS will accept charge even in this state — the device should boot normally once the cell reaches approximately 3.6V.

Compatible Models

Genio E550G

Replaces Part Numbers

CET0301A

Technical Specifications

Voltage3.7V
Amp Hours1200mAh
Capacity1200mAh
Rate4.44Wh
Gross Weight100g /3.53 oz
Approximate Weight100g /3.53 oz

Product Highlights

  • Brand: Toshiba
  • 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 Genio E550G lost all my contacts and calendar data after I swapped the battery — is that normal?

Yes, and it happens because the E550G stores active data in SRAM, which is powered directly by the main battery. The moment the old cell is removed, that RAM loses power and the contents are gone — there is no background retention. Always perform a full ActiveSync or data sync to a host PC before pulling the battery. Restore from that sync file after the new cell is installed.

The Genio E550G boots to the setup wizard after fitting the new battery, as if it's been factory reset — why?

This is the same SRAM wipe that causes data loss, but it also clears the device's stored OS configuration and user profile from volatile memory. The E550G has no internal flash partition that preserves user settings across a full power loss — everything in RAM is gone. A restore from a recent ActiveSync backup brings the device back to its previous state. Run a backup before every battery swap going forward.

Wireless sync keeps dropping on the Genio E550G right after fitting the replacement battery — what's causing it?

The wireless radio on the E550G is voltage-sensitive and draws a sharp current spike when the transmitter fires. If the new cell has not reached a full charge, the voltage sag under that spike can cause the radio to reset mid-transmission. Charge the device fully before attempting a wireless sync — the BMS should show a complete charge cycle with the charger removed before you connect. Once the cell is at 4.2V, the radio holds its connection through normal transmission load.

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