Hello, I have a card with a radio, a stereo with a lithium battery, and I want to change it to a direct plug. How? What do you need? Thank you?

Your module is estimated to be 3.7V-5V universal. (First determine how many volts your battery is)

1. Locate the positive and negative terminals that connect the two battery cables. Make no mistake, many of these modules do not have reverse protection.

2. The simplest is to find an old mobile phone charger as a power supply, but the charger is generally a switching power supply, there is interference, the radio can not be used.

3. The most practical thing is to go to the market to buy a 3-5V transformer power supply, which can be used normally when connected!