Here are many types of DC-DC Charger, and good DC chargers should have the following characteristics:

   1． Stable output current: A good DC charger can provide stable output current, avoiding excessive or insufficient current impact on the device.

   2．  Fast charging speed: A good DC charger can fully charge the device in a short period of time, and will not overheat due to prolonged use.

   3．  High safety: Good DC chargers have multiple protection measures, such as over-current protection, over-voltage protection, over-temperature protection, etc., to ensure the safety of devices and users.

   4．  Strong compatibility: Good DC chargers can be used for various brands and models of devices, providing suitable output current and voltage for different devices.

       Taking into account the above factors, I recommend choosing a well-known brand with a good reputation and meets relevant certification standards for DC chargers.