The hand warmer cannot charge your phone as expected, please follow the steps below to see if it helps
- Try to fully charge the hand warmer;
- try another charging cable;
- try to charge other devices;
- try the correct output port;
If troubleshooting doesn't help and we can move on to the next step to file a warranty claim, please send it to us:
- A screenshot of your purchase where we can see the date of purchase, order number and store name;
- A video showing the problem to help us analyze the problem.

The hand warmer is not charging as expected. Please try the following steps:
- try another charging cable;
- try another charger;
- try the correct input port, not the output port;

If troubleshooting doesn't help and we can move on to the next step to file a warranty claim, please send it to us:
- A screenshot of your purchase where we can see the date of purchase, order number and store name;
- Video showing the question.

After everything is confirmed, we will provide the information to replace it for you.

All of our hand warmers feature overheat protection. If the temperature of the product itself is too high, it will automatically cool down for 3-5 minutes, and then start to heat up again. As a result, we experience temperature instability or sometimes seem to stop working.

If the hand warmer doesn't heat up as expected, try the following:
- Try charging the hand warmer with other charging cables and chargers;
- Try to turn the product to high level after fully charged;
If troubleshooting doesn't help, please feel free to contact us.

📧:support@ocoopa.com

The important factors for judging the quality of rechargeable hand warmers are as follows:

• Safety certification: Ensure that the product has passed the necessary safety certification, such as CE certification, to ensure product safety and compliance.
• Heating Technology: High-quality products use advanced heating technology to distribute heat evenly and avoid overheating or uneven heating.
• Battery quality: Use high-quality batteries to provide a more stable power supply and avoid battery performance degradation or safety hazards.
• Material safety: Ensure that the shell material of the product is environmentally safe and will not cause harm to human health.

High-quality rechargeable hand warmers have undergone rigorous safety testing and certification to meet safety standards. However, you also need to pay attention to the following items during use:

• Avoid overheating: Do not use continuously for a long time so as not to cause overheating. The time and frequency of use should be in accordance with the product instructions.
• Avoid Wetness: Avoid immersing the rechargeable hand warmer in water or using it in a humid environment to prevent short circuits.
• Use by children: Children should be under adult supervision when using the product, and make sure that the product cannot be misused or swallowed.

Here are a few tips to follow when using rechargeable hand warmers:

• Charging: Before the first use, the power bank needs to be fully charged. Please use the included charging cable and adapter when charging, and avoid using unmatched charging equipment.
• Use: When turning on and off the hand warmer, please operate according to the instructions on the product manual and do not over-extrude or damage the product shell during use.
• Storage: When not in use for a long time, it is recommended to keep the power bank at 50% power and store it in a dry environment that avoids high temperatures and humidity.