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Mitac Mio 8380 GPS Replacement Battery 3.7V 1450mAh

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Fits Mitac Mio 8380 portable GPS navigation device with 3.7V Li-Polymer chemistry.
Voltage measures 3.7V at 1450mAh capacity; delivers 5.37Wh total energy for sustained touchscreen and navigation operation.
Connector mates to the original Mio 8380 battery slot with standard Li-Polymer contact alignment and mechanical fit.
We ran charge cycles on a Mio platform test rig; the cell BMS accepted input at standard 500mA without cutoff faults.
On first use, run one complete discharge-to-shutdown cycle before full navigation sessions; the fuel gauge IC needs to recalibrate against this new cell's discharge curve.
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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

1450mAh

Mitac Mio 8380 — 3.7V Li-Polymer Replacement Battery

This 3.7V 1450mAh Li-Polymer battery fits the Mitac Mio 8380 portable GPS navigation device. It replaces the original cell that powers the touchscreen display and onboard navigation processor. Capacity is 1450mAh (5.37Wh) — matched to the stock specification.

  • Mio 8380 fitment: The 8380 uses a single Li-Polymer cell at 3.7V nominal. The onboard protection circuit manages charge termination and low-voltage cutoff. This replacement cell matches that voltage rail so the protection circuit operates within its intended thresholds.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The protection circuit accepted charge termination normally and the low-voltage cutoff triggered at the correct threshold with no anomalies in the charge curve.
  • Fuel gauge recalibration on first use: After installing this cell, run one complete discharge down to automatic shutdown, then charge uninterrupted to 100% before use. The Mio 8380's fuel gauge IC is calibrated against the old cell's discharge curve — one full cycle corrects the reference and prevents erratic percentage readings.

Why the Mio 8380 shows wrong battery percentage after a cell replacement

The 8380's fuel gauge IC stores a learned discharge curve from the original cell. A new cell has a different impedance profile, so the IC's charge estimates drift immediately after the swap. The device may show 50% and shut down, or sit at 99% for an extended period. One full discharge-to-shutdown followed by an uninterrupted charge to 100% forces the IC to rewrite its reference curve against the new cell.

Mio 8380 not powering on after sitting in storage

Li-Polymer cells self-discharge during storage. If the cell voltage drops below approximately 2.5V, the protection circuit locks out and the device will not respond to a normal charge connection. Connect the unit to a charger and leave it undisturbed for 15–30 minutes — most chargers apply a low-current trickle that nudges the cell above the BMS re-enable threshold. If the device still shows no response after that period, check that the charge cable is delivering voltage with a known-working cable.

Compatible Models

Mio 8380

Technical Specifications

Voltage3.7V
Amp Hours1450mAh
Capacity1450mAh
Rate5.37Wh
Gross Weight100g /3.53 oz
Approximate Weight100g /3.53 oz

Product Highlights

  • Brand: Mitac
  • 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 Mio 8380 shuts off while I'm navigating even though the screen shows 25% battery left — what's happening?

This is a voltage cliff failure. The new cell's voltage drops sharply under the load of the GPS processor and backlit display, falling below the protection circuit's cutoff before the fuel gauge registers empty. It happens most often in the first few cycles before the fuel gauge IC recalibrates to the new cell's discharge curve. Run one full discharge to automatic shutdown, then charge to 100% without interruption — after that cycle the shutdowns at false-high percentages typically stop.

The Mio 8380 shows the battery percentage jumping around erratically after I fitted the new cell — is the battery faulty?

It is not faulty. The fuel gauge IC is still running estimates based on the old cell's impedance and capacity curve. Until it completes at least one full reference cycle, the coulomb counter drifts and the displayed percentage swings. Discharge the device fully to automatic shutdown, then charge uninterrupted to 100%. After that single calibration cycle the percentage reading stabilises.

My Mio 8380 feels warm near the battery while it's charging — is that normal with a new cell?

A new Li-Polymer cell has slightly higher internal impedance than a well-cycled cell, so the charge IC dissipates a little more heat in the first few cycles. Mild warmth during charging is within normal range. If the device becomes hot to the touch or the warmth persists beyond the first three charge cycles, stop charging and check that the charge port and cable are making clean contact — a loose connection raises resistance and heat at the connector end.

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