Safety Guide for Charging Electric Bicycles in Rainy Season: 3 Hidden Risks + Professional Protection Solutions To Protect Battery Life​

     Last week, we disassembled a battery sent in for repair. While the casing appeared clean, the internal circuit board was covered with white-green corrosion marks resembling mold—a condition we call "rain season disease" in the workshop. customer was perplexed: "I always dry it after getting wet!" The problem often lies in those overlooked details after "drying." Based on the most common issues encountered during the rainy season at  repair stations, I've identified three prevalent misconceptions and practical protective measures.


1.Most People Have Fallen into These Three Pitfalls

Pitfall 1: Is it enough to dry the surface? The moisture in the interface gap is waiting to be "energized".

 We checked with a magnifying glass and found that there were many tiny gaps invisible to the naked eye on the metal contacts of the charging port. You wipe away the water droplets on the surface, but the moisture in the gaps is still there. Connecting the charger at this time is equivalent to energizing the water, which may cause the charger to report an error, or may gradually corrode the interface. My practical advice: after drying, don’t rush to recharge. Put away your things first, drink water, wait for about fifteen minutes, and let the remaining moisture evaporate naturally. This is the safest way.

Pitfall 2: Is garage charging necessarily safe? High humidity environment is quietly "eroding" your battery.

In garages during the rainy season, the humidity often exceeds 80%. If the battery is charged in this environment for a long time, moisture will act like a chronic poison and slowly corrode the circuit inside the battery. A previous customer who lived by the river had his battery charged in the garage for half a year, and the cruising range was cut in half. When I took it apart, I found that the contacts on the circuit board had patina. Therefore, if the weather APP shows that the humidity exceeds 75%, it is best to take the battery to a dry place indoors to charge.

Pitfall 3: Recharge when the battery is still warm? Be careful of "condensation" inside.

When riding in rainy days, the battery will heat up. If you leave it in a cool garage or outside immediately after riding, the temperature difference can cause condensation to form inside the battery, much like water beads up on the outside of a cold drink can. This internal moisture can create safety hazards. The correct habit is: after riding home on a rainy day, first place the battery in a ventilated place indoors for about 20 minutes, and wait until its temperature is close to room temperature before charging.

2. How to choose a charger? Pay attention to these three key points
 

It's important to be cautious, but a reliable charger is the last line of safety. When we design products, we pay most attention to the following three points, which you can also use as reference standards when purchasing:
1. Power off quickly: safety lies in milliseconds. The short-circuit protection response time of ordinary chargers is usually about 20 milliseconds. But we have dealt with too many cases of instant short circuits caused by moisture, so we raised the standard to 5 milliseconds. Don't underestimate the gap of more than ten milliseconds. It can completely cut off the power supply before abnormal current damages the components. This is the real safety guarantee.
2. To be able to cope with the "fluctuations" of the power grid: thunderstorms must be stable. There are many thunderstorms in the rainy season, and the power grid is prone to instantaneous voltage surges. Our charger has a built-in real-time voltage monitoring chip, which can detect danger within a circuit oscillation (about 0.01 seconds) and activate protection to prevent the battery from high-voltage shock.

3. Don’t ignore these certifications for chargers:

The quality of chargers on the market varies. When buying, be sure to check whether they have these safety certifications. They are not gimmicks and have been tested by independent institutions:

CE certification: complies with the unified European safety standards, and the insulation and anti-electric shock performance are up to standard;

RoHS certification: restricts the use of harmful substances and is more friendly to the human body and the environment;

 
3. Simple 5-step self-check guide (recommended to collect

1. Judgment by hand feel: Touch the body, battery or charging interface with your hands. If there is a feeling of moisture, never charge.

2. Environmental check: Use your mobile phone to check the current humidity. If it is higher than 75%, give priority to charging in a dry indoor location.

3. Let it dry and let stand: After using it on rainy days, give the battery at least 15 minutes to let the moisture on its surface and gaps dissipate before starting to charge.

4. Choose a location: Keep away from windows and sewer pipes when charging to prevent rainwater splashing or accidental water leakage.

5. Regular inspection: Check the charging port with a flashlight every month. If you find that the contacts are black or green, please contact us for maintenance in time.

Finally I want to say to you

We mark each charger with a clear protection level and provide a three-year warranty - not because we think it will "never break", but because we are well aware of the impact of "daily charging habits" on battery life. Those seemingly inconspicuous things like "wait 15 minutes to dry" and "choose a dry area to charge" are the key to making the battery last for 3 years or 1 year.

The best maintenance is always “prevention in advance”. This rainy season, give your e-bike a few more minutes to dry, and it will be able to travel with you safer and longer.

If you have encountered problems when charging during the rainy season, or have your own moisture-proof tips, please share your experience, which may help more cyclists. If you need to know more about charger selection or battery maintenance, you can also click "Contact Us" below~