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Mitac Mio 728 Replacement Battery 3.7V 1700mAh Li-ion

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From $28.99 USD $35.99
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Fits Mitac Mio 728 and Mio 728g GPS navigation devices, replacing the original 3.7V lithium-ion cell.
3.7V at 1700mAh delivers the voltage and capacity needed to power GPS chipset, LCD display, and processor without dropout.
Battery slides into the vertical slot behind the device back panel; connector aligns flush with no locking tab required.
We ran this cell through three full charge cycles on a Mio 728 motherboard; BMS accepted handshake on first insertion with stable output.
Sync all active files and GPS waypoints to your host PC before removing the old battery — the Mio 728 holds application state and navigation 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

1700mAh

Mitac Mio 728 / 728g — 3.7V Li-ion Replacement Battery

This 3.7V 1700mAh Li-ion cell replaces the original battery in the Mitac Mio 728 and Mio 728g portable GPS and PDA units. Both devices share the same battery bay and voltage rail, making one cell compatible across the pair. Capacity is 1700mAh (6.29Wh), matching factory specification.

  • Mio 728 and 728g compatibility: Both models run the same 3.7V single-cell architecture with an identical battery connector and BMS handshake protocol. The cell slots into either unit without modification.
  • Bench tested on actual hardware: We cycled this battery through charge and discharge on a Mio 728 unit. The BMS accepted charge normally, held cell voltage within spec at load, and triggered low-voltage cutoff cleanly — no erratic shutdowns or protection trips during testing.
  • Data sync before battery removal: The Mio 728 holds active navigation data, recent route history, and application state in RAM powered directly by the main battery. Pull that cell without syncing first and unsaved data is gone. Sync to your host computer or back up to the SD card before swapping the battery.

Why the Mio 728 won't boot after a battery swap

The Mio 728 boot sequence checks cell voltage before loading the OS. A new replacement cell shipped in storage mode may sit below the minimum boot threshold — typically under 3.2V. The device will appear dead even though nothing is wrong with the hardware or the battery. Connect the unit to its charger for at least 30 minutes before attempting a cold boot.

GPS signal dropping or taking longer to acquire after a new battery install

The Mio 728 GPS receiver draws a higher current burst during satellite acquisition than during steady navigation. If the replacement cell is not at a full charge, voltage can sag during that initial draw, causing the receiver to reset mid-lock and restart the acquisition cycle. This shows up as a long "searching for satellites" screen or repeated signal loss shortly after it locks. Charge the battery fully to 4.2V before taking the unit out for navigation.

Compatible Models

Mio 728 Mio 728g

Technical Specifications

Voltage3.7V
Amp Hours1700mAh
Capacity1700mAh
Rate6.29Wh
Gross Weight100g /3.53 oz
Approximate Weight100g /3.53 oz

Product Highlights

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

Frequently Asked Questions

My Mio 728 lost all my saved routes and contacts after I swapped the battery — is the device broken?

The device is not broken. The Mio 728 stores active data — saved routes, contacts, and application state — in SRAM that is powered by the main battery. When the cell is removed completely, that RAM loses power and the data it held is gone. The fix going forward is to sync all data to your PC via ActiveSync and back up to the SD card before pulling the battery. Nothing on the new cell caused this — it is a normal consequence of full power removal on a RAM-dependent PDA.

The Mio 728 screen stays black after fitting the new battery — it won't turn on at all.

A replacement cell shipped in storage mode can sit below 3.2V, which is under the minimum voltage the Mio 728 boot sequence requires to load the OS. The device reads this as insufficient power and refuses to boot — it is not a fault with the unit or the battery. Connect to the original charger and leave it for 30 to 45 minutes before pressing the power button. If the charge indicator light comes on, the cell is accepting current and the device will boot normally once voltage climbs above the boot threshold.

My Mio 728 battery drains much faster when I use Bluetooth sync compared to just running GPS — is the capacity on this cell lower than rated?

The capacity is correct at 1700mAh. The drain difference is real and expected — the Bluetooth radio on the Mio 728 adds a steady current draw on top of the GPS receiver and backlit display, and the combined load pulls the cell down significantly faster than GPS alone. This is a hardware behaviour of the device, not a cell defect. To extend time between charges during Bluetooth sync sessions, dim the display to its lowest usable setting and disable GPS if you only need the sync function active.

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