This article explains how to troubleshoot the W05 High Temperature Charging Protection warning on an Aventon eBike.

Use this article if your bike:

• Shows a W05 warning code
• Stops charging during hot conditions
• Displays a high temperature charging warning
• Does not charge normally after exposure to heat

If you are unsure of your Aventon model, please confirm your model before continuing.

Stop troubleshooting immediately if anything looks unsafe, damaged, swollen, overheated, or smells burnt.

Before You Start

Please prepare the following:

• Order number
• Aventon model
• Photo or video of the W05 warning code
• Photo of the battery area
• Photo of the charger and charger light
• When the issue first appeared
• Whether the bike powers on
• Whether the battery charges
• Whether the charger light changes during charging
• Whether the issue happened after hot weather exposure, transport, storage, water exposure, crash, impact, modification, or third-party repair
• Photos of visible damage

Safety Warnings

• Do not continue charging if the battery, charger, or cable becomes excessively hot.
• Do not continue charging if there is a burning smell, smoke, swelling, or visible damage.
• Do not open sealed electrical components.
• Do not work on wiring while the bike is powered on or charging.
• Stop and contact support if you are unsure.

What This Warning Means

The W05 High Temperature Charging Protection warning means the battery temperature or charging environment is too hot for safe charging.

The bike may temporarily stop charging to help protect the battery and charging system.

Possible Causes

Possible causes include:

• Ambient temperature is too high
• Battery is damaged
• Charger is damaged

Troubleshooting Steps

Step 1 – Move the Battery to a Cooler Environment

Stop charging the bike before continuing.

Place the battery in an environment between:

• 32°F to 104°F
• 0°C to 40°C

Leave the battery in this environment for 2 hours.

After 2 hours:

• Reconnect the charger
• Attempt to charge the battery again
• Check whether the W05 warning remains

If yes – The W05 warning still appears

Continue to Step 2.

If no – The warning clears

The issue was likely caused by charging the battery in a high temperature environment.

Continue charging the battery within the recommended temperature range.

If the issue clears

Monitor the battery during future charging.

If the issue remains

Continue to Step 2.

Step 2 – Check Whether the Warning Persists

After cooling the battery and reconnecting the charger, check whether:

• The battery charges normally
• The charger light changes correctly
• The W05 warning returns

If yes – The W05 warning still appears

The issue may involve the battery or charging system.

Please contact our support team with the photos/videos listed below so we can review the next step.

If no – The warning no longer appears

The issue was likely caused by temporary high temperature charging conditions.

Continue monitoring the bike during charging.

Step 3 – Inspect the Battery for Visible Damage

Inspect the battery for:

• Swelling
• Cracks
• Water exposure
• Burning smell
• Overheating
• Physical damage

If yes – Visible damage is found

Stop using the battery immediately.

Do not continue charging or riding the bike.

Please contact our support team with photos/videos of the battery and charger.

If no – No visible damage is found

Reconnect the charger and check whether the battery charges normally.

If the issue remains

The battery system may require further inspection.

Please contact support.

Step 4 – Inspect the Charger for Visible Damage

Inspect the charger for:

• Overheating
• Burning smell
• Damaged cables
• Loose connectors
• Cracks or physical damage

If yes – Visible damage is found

Stop using the charger immediately.

Please contact our support team with photos/videos of the charger and charging cable.

If no – No visible damage is found

Reconnect the charger and check whether the W05 warning returns.

If the issue remains

The charging system may require further inspection.

Please contact support.

Step 5 – Check Charging Conditions

Check whether the issue happened:

• During hot weather
• After storing the bike in a hot environment
• During charging in direct sunlight
• During charging in poorly ventilated areas

If yes

Allow the battery and charger to cool before charging.

Charge the bike in a cooler, ventilated environment within the recommended temperature range.

If no

The battery or charger system may require further inspection.

Please contact support.

If the issue remains

Please contact support.

When To Contact Support

Please contact support if:

• The W05 warning remains after completing these checks
• The battery does not charge
• The charger overheats
• The charger light does not respond normally
• The battery shows visible damage or swelling
• The bike has been exposed to water, crash, impact, transport damage, modification, or third-party repair
• You are unsure how to safely complete a step

If the issue remains after these steps, please contact our support team and include the photos/videos listed below.

What To Send Support

Please send:

• Order number
• Aventon model
• Photo/video of the W05 warning code
• Photo of the battery area
• Photo of the charger and charger light
• Photos of visible damage
• Confirmation of whether the bike powers on
• Confirmation of whether the battery charges
• Confirmation of whether the charger light changes during charging
• Confirmation of the charging temperature conditions
• Confirmation of whether the issue happened after hot weather exposure, water exposure, crash, impact, modification, or third-party repair
• Confirmation of the troubleshooting steps already completed

Important Safety Notes

• Do not continue charging if the W05 warning remains.
• Do not use the bike if the battery or charger is overheating, swollen, smoking, leaking, or visibly damaged.
• Do not open the battery, charger, controller, or sealed electrical components.
• Do not force connectors.
• Do not work on wiring while the bike is powered on or connected to the charger.
• Contact support if you are unsure.