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O2 XDA Xphone IIm Replacement Battery BTR5600B 3.7V 2200mAh

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From $29.99 USD $36.99
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Fits O2 XDA Xphone IIm; replaces BTR5600B, ST26B, ST26A battery packs.
3.7V lithium-ion cell at 2200mAh delivers the voltage this PDA needs for stable boot and standby power.
Connector seats vertically into the device's battery bay; locking tab aligns flush with the slot frame.
We charged this pack in the XDA Xphone IIm dock and verified the BMS accepted the charge curve without cutoff errors.
Sync all calendar, contacts, and email data to your host computer before removing the old battery — the XDA Xphone IIm holds open application state in RAM powered only by this cell, and full power removal 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

2200mAh

O2 XDA Xphone IIm — 3.7V Li-ion Replacement Battery (BTR5600B)

This is a 3.7V Li-ion replacement battery rated at 2200mAh (8.14Wh) for the O2 XDA Xphone IIm. The XDA Xphone IIm is a mid-2000s Windows Mobile PDA and smartphone combo used for email, contacts, and calendar management. It fits directly in the original battery bay and connects to the same contact points as the factory cell.

  • XDA Xphone IIm compatibility: The XDA Xphone IIm uses a single-cell Li-ion configuration at 3.7V nominal. OEM part numbers BTR5600B, ST26B, and ST26A all reference the same physical cell and connector format for this device.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on compatible hardware. The BMS reached full charge cutoff at 4.2V and held stable voltage through moderate load — typical of Windows Mobile OS use with active sync and radio.
  • RAM data before battery removal: Sync all open data to a host computer before pulling the battery. The XDA Xphone IIm stores active application state and unsaved files in volatile RAM powered by the main cell — a full power removal wipes that memory instantly.

XDA Xphone IIm data loss after battery swap

The XDA Xphone IIm relies on its main battery to keep SRAM contents alive. Unlike flash storage, SRAM loses all data the moment power drops to zero — contacts, calendar entries, and installed apps stored in RAM are gone. There is no capacitor buffer long enough to survive a full battery pull. Before swapping the cell, perform a full ActiveSync backup to a PC and confirm the sync completed successfully.

XDA Xphone IIm not booting after new battery installed

A freshly shipped Li-ion cell may arrive at a storage charge of around 3.0–3.3V. The XDA Xphone IIm boot sequence draws a surge of current that the BMS may block if voltage is below its minimum operating threshold. The device will appear dead — no screen, no response to the power button. Charge the new battery for at least 30 minutes before attempting the first boot.

Compatible Models

XDA Xphone Iim

Replaces Part Numbers

BTR5600B ST26B ST26A

Technical Specifications

Voltage3.7V
Amp Hours2200mAh
Capacity2200mAh
Rate8.14Wh
Gross Weight100g /3.53 oz
Approximate Weight100g /3.53 oz

Product Highlights

  • Brand: O2
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My XDA Xphone IIm lost all my contacts and calendar after I swapped the battery — why?

The XDA Xphone IIm stores active data in SRAM, which requires continuous power to hold its contents. The moment the battery is removed, that memory clears completely — contacts, calendar, and app state are gone. This is not a battery fault; it is how volatile RAM works on Windows Mobile hardware. Before your next swap, run a full ActiveSync sync to a PC and confirm the transfer completed before pulling the cell.

The XDA Xphone IIm won't turn on at all after fitting the new battery — is the battery dead?

Almost certainly not. Li-ion cells ship at a reduced storage voltage, often around 3.0–3.3V, to slow degradation in transit. The XDA Xphone IIm's boot sequence demands enough current that the BMS will cut output if voltage is too low, making the device appear completely unresponsive. Put the battery on charge for at least 30 minutes first, then attempt to power on. If the screen remains blank after a full charge cycle, check that the battery contacts are clean and seated flat.

Battery life on my XDA Xphone IIm seems much shorter when I'm using wireless sync — is something wrong?

Nothing is wrong — wireless radio draw on the XDA Xphone IIm is significantly higher than standby current. The Bluetooth and Wi-Fi radios pull voltage down faster than the rated capacity figure implies, because that figure reflects a steady low-drain discharge, not active radio use. Voltage sag under radio load can also cause the device to report a lower charge percentage than the cell actually holds. Turn off any radio that is not actively in use, and let the battery run through two or three full charge cycles to let the BMS calibrate the gauge accurately.

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