Garmin Edge 305 Battery Guide: Check 361-00025-00 Before Replacement

Replacing a Garmin Edge 305 battery? Start by checking the original battery label and connections, rather than choosing by the device name alone.

Review the STARNOVO 3.7V 1000mAh replacement battery for Garmin Edge 305, part number 361-00025-00, and compare its specifications with your original before ordering.

Short battery life can make a cycling GPS frustrating to use. However, a device that will not charge or shuts down unexpectedly does not automatically need a new battery. Charging connections and other device faults should also be considered.

This guide covers the information to check before choosing an internal replacement battery for the Garmin Edge 305. It is a compatibility checklist, not a model-specific teardown procedure.

1. Confirm the Device and Battery Part Number

The linked STARNOVO battery is listed for the Garmin Edge 305 cycling GPS computer and original battery part number 361-00025-00.

Do not assume that a battery for another Garmin Edge model will fit. Similar device names, matching voltage, or a similar-looking battery do not establish compatibility.

Before ordering, compare the original battery label with the replacement product information. If you cannot safely access the original battery, ask a qualified repair technician to help identify it.

2. Compare the Battery Specifications

The replacement product currently lists:

  • Compatible device: Garmin Edge 305
  • Replacement part number: 361-00025-00
  • Nominal voltage: 3.7V
  • Stated capacity: 1000mAh
  • Listed dimensions: 5.5 × 34.5 × 51.0 mm

Check the measurements against the original battery and available internal space. Also compare the connection type, wire arrangement, and polarity. Do not force a connection or modify wiring to make an uncertain replacement fit.

Capacity alone does not determine fit or guarantee a particular runtime. Device condition, settings, and usage affect how long the GPS operates between charges.

3. Check Charging Before Assuming Battery Failure

Before arranging a battery replacement, check the external charging setup:

  • Try a known-working cable and a compatible power source.
  • Inspect the charging connection for visible damage or contamination.
  • Follow the device manufacturer’s troubleshooting instructions.
  • Note whether the problem changes with a different cable or power source.

These checks do not diagnose every fault, but they can help avoid replacing a battery when the charging setup is responsible. If charging problems persist, seek a repair assessment.

4. Plan the Internal Replacement Carefully

This is an internal battery replacement that requires opening the device. It is not an external plug-in accessory.

Use verified repair instructions for the exact Garmin Edge 305 model. This article does not establish the opening method, required tools, or internal connection procedure.

  • Power off the device and disconnect external power before servicing.
  • Do not pull on wires or force connections.
  • Do not bend, puncture, crush, or apply heat to the battery.
  • Stop if the replacement differs from the original connection arrangement or does not fit without pressure.
  • Seek qualified repair assistance if you are unsure about opening the device or checking polarity.

Opening a device can affect its housing and seals. Do not assume that its original water resistance remains unchanged after repair.

5. Know When to Stop Using the Battery

If the battery is swollen, leaking, visibly damaged, or unusually hot, stop using and charging the device. Do not attempt to flatten, puncture, or force a swollen battery out of its housing. Seek qualified assistance.

Use an appropriate local battery collection or recycling service for the removed battery. Do not place lithium batteries in household waste.

6. Get Help Checking Compatibility

If you are unsure whether this replacement matches your device, email sales@starnovo.com with:

  • A clear photo of the device model label.
  • A readable photo of the original battery label, if safely accessible.
  • Photos of the battery connections and wire arrangement.
  • The original battery measurements, if available.

For a broader purchasing checklist, read our replacement battery buying guide. For everyday charging and storage advice, see our battery care guide.

View the Garmin Edge 305 Replacement Battery →
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