Segway Ninebot E2 Pro: error 39, battery temperature abnormal

Your Segway Ninebot E2 Pro shows 39 and beeps three long and nine short, and it may not accelerate normally or charge. Segway's E2 Pro self-test manual says code 39 is caused by an abnormal battery temperature. The short answer: get the scooter into normal temperatures, let it sit for more than half an hour, and power on again. If 39 stays, the battery needs replacing by Segway after-sales.

Most likely cause

The battery has a temperature sensor, and the scooter limits riding and charging when it reads too hot or too cold. Segway's self-test manual says to make sure the ambient temperature is between 14°F and 122°F (minus 10°C to 50°C), let the scooter stand for more than half an hour, then turn it on (Segway self-test manual). Segway's E2 Pro product manual says that with a temperature warning the scooter can't accelerate normally and may not charge, and lists charging between 32°F and 113°F and riding between 14°F and 104°F.

Other causes to rule out

• Hard riding or charging right after a hot ride, which warms the pack.
• Storage in a hot car, garage or a freezing shed.
• A failed temperature sensor or battery, if 39 stays at room temperature. Segway's manual says to replace the battery then.
• A different battery code. Segway lists 21 as battery communication and 23 as an abnormal battery condition to check in the app. (Segway self-test manual)

How to confirm

1. Count the beeps: three long and nine short is 39.
2. Note where the scooter was: in the sun, a cold garage, or just ridden hard.
3. Move it indoors to normal room temperature and leave it switched off for more than half an hour, as Segway says.
4. Power on. If 39 has cleared, wait before charging until the scooter feels room temperature.
5. Open the Segway app, which the product manual says shows device temperatures and code details.
6. If 39 shows again at room temperature, stop using the scooter and contact Segway.

Fix options

Let it rest at a normal temperature (easy)

Segway's first fix and usually enough. Keep the scooter in the ranges the manual gives. See e-bike battery care and store your battery for winter; the same habits apply to scooter packs.

Replace the battery (pro)

If 39 persists in normal temperatures, Segway's manual says the battery needs replacing. On the E2 Pro this is a service center job.

Parts

• E-bike battery (scooter pack, fitted by Segway after-sales)

Videos

When to get a pro

Stop and get help if the deck is hot to the touch, swollen, smells odd, or got soaked, or if 39 stays at room temperature. See battery won't charge, Segway Ninebot scooter troubleshooting and when to call a pro.

Sources

• E2 Pro self-test manual, support.segway.com
• support.segway.com
• E2 Pro product manual, store.segway.com
• How to Check Error Codes Meanings on Segway Ninebot eKickscooter E2 Pro, youtube.com

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