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Palm M550 IA1TA16A0 Compatible Battery 3.7V 1100mAh

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From $23.99 USD $29.99
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Fits Palm M550, Tungsten T1, T2, T3 and replaces OEM part IA1TA16A0, IA1W721H2, IA1T923A0, GA1W918A2, IA1W416A2, PBA80860US, GA1W922A2.
3.7V 1100mAh Li-Polymer cell delivers 4.07Wh — enough to restore full standby time on aging M550 units that won't hold charge past a few hours anymore.
Connector seats flush into the M550 battery slot with a single friction tab; no clips or latches — orientation marked on the case, fits only one way.
We bench-tested this cell on an M550 boot cycle; BMS accepted the pack cold and voltage climbed to full within two hours using the original charger with no fault codes.
Perform a full data sync to your host computer before removing the dead battery — the M550 powers its RAM and open applications from the main cell, so pulling it without syncing causes loss of unsaved contacts, calendar entries, and document edits.
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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

1100mAh

Palm M550 / Tungsten Series — 3.7V Li-Polymer Replacement Battery (IA1TA16A0)

This 3.7V, 1100mAh Li-Polymer cell replaces the original battery in the Palm M550 Pocket PC and the Tungsten T1, T2, and T3 handhelds. It matches the OEM voltage and physical dimensions (51.06 × 33.02 × 5.32mm) required for proper fitment and connector engagement. Use it to restore a PDA that no longer holds charge or powers on reliably.

  • Multi-model fit — M550 and Tungsten platform: These models share a common battery footprint, voltage rail, and connector pinout. The M550 and Tungsten T1 through T3 all draw from the same 3.7V Li-Polymer architecture, so one cell covers the full group without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on a Palm Tungsten T3 unit. The BMS held charge acceptance cleanly from 3.0V upward and terminated correctly at full capacity without thermal event or cutoff trip.
  • Sync before you swap: The M550 and Tungsten handhelds keep open files, unsaved notes, and application state in volatile SRAM. That memory is powered entirely by the main battery. Remove the cell before syncing and that data is gone. Do a full HotSync to your host computer first, then swap the battery.

Why the Tungsten T3 won't complete a boot after a battery swap

The Tungsten T3 boot sequence draws a surge of current to initialise the processor and load the OS from flash into SRAM. A freshly installed cell shipped at storage charge — typically 30–50% — can sag below the minimum voltage threshold that triggers this load. The device stalls mid-boot or shows nothing on screen. This is not a faulty battery. Charge the cell fully before attempting first boot, and the sequence completes normally.

Wireless sync dropping or stalling on the M550 after battery replacement

The M550's IR and Bluetooth radio modules are voltage-sensitive and pull harder than standby loads. If the replacement cell is not fully charged, voltage under radio load can sag enough to cause the sync to stall, drop, or throw a connection error. This gets misread as a software or cradle problem. Charge the battery to full — confirmed by the charge LED extinguishing — then retry the HotSync before troubleshooting the connection further.

Compatible Models

M550 Tungsten T1 Tungsten T2 Tungsten T3 Zire 31 Zire 71 Zire 72 Zire 72s

Replaces Part Numbers

IA1TA16A0 IA1W721H2 IA1T923A0 GA1W918A2 IA1W416A2 PBA80860US GA1W922A2

Technical Specifications

Voltage3.7V
Amp Hours1100mAh
Capacity1100mAh
Rate4.07Wh
Net Weight18.5g /0.65 oz
Gross Weight44g /1.55 oz
Approximate Weight44g /1.55 oz
Dimension 51.06 x 33.02 x 5.32mm

Product Highlights

  • Brand: Palm
  • 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 Palm M550 lost all my contacts and calendar data when I swapped the battery — is that normal?

Yes, and it happens because the M550 stores contacts, calendar entries, and app data in SRAM — volatile memory that requires continuous battery power to retain its contents. The moment the old cell is removed and before the new one makes contact, that memory clears completely. The fix is to run a full HotSync to your desktop before removing the battery, so the data is backed up and can be restored immediately after the swap.

The Tungsten T3 just shows a blank screen after I installed the new battery — nothing happens when I press the power button.

The T3 boot sequence pulls enough current to sag a partially charged cell below the minimum voltage needed to complete initialisation. A new battery ships at storage charge, usually around 30–50%, which is often not enough to get through that first boot surge. Connect the device to its charger and leave it for at least two hours before pressing power — once the cell is above approximately 3.6V, the boot sequence runs without issue.

Battery life on my Tungsten T2 seems much shorter than it was with the original — drains faster when I'm using the wireless sync or IR beam features.

The T2's radio and IR transmitter draw significantly more current than the processor does at idle — this is expected behaviour, not a battery fault. Capacity fade on the original cell made it less obvious because the baseline was already low; a fresh 1100mAh cell makes the radio draw more noticeable by comparison. If drain still seems excessive, check that IR receive mode is not left active in the preferences panel, as passive listening keeps the IR port powered between uses.

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