2.1/2.5 is the size of the middle plug, representing 2.1mm and 2.5mm
 
Connection of the 2.1/2.5 female socket and 2.1/2.5 male plug together with the corresponding photographed can be matched!
 
Female socket is red wire positive black wire negative
 
The male plug is blue wire positive pole brown wire negative pole 

Attention ! ! !  

1. As such products are industrial semi-finished products. Is an electric car charger, electric car battery spare parts.
2. The use involves wiring technology, circuit identification of positive and negative poles, battery motor equipment controller link test. Therefore, you need to have knowledge of electrical equipment testing and circuit identification of positive and negative poles.
3. If you do not understand the knowledge of the circuit. Strongly request you to go to the local electric vehicle professional repair point or business department to ask the professional staff to test the replacement after receiving the parts. If there is a quality problem is also guaranteed, you can negotiate with customer service for a refund or exchange.
4. The positive and negative colours indicated in this link are only limited to our products, and do not mean that all chargers and vehicles on the market are the same. Because the shop products for general-purpose parts, non-original parts. Manufacturers of various brands of vehicle battery circuit charging port and the charger positive and negative electrodes are not the same colour line. In other words even if the wire is the same colour, the positive and negative terminals may be reversed. I.e. no colour to colour wiring! It has to be positive to positive and negative to negative! Positive terminal is +N, negative terminal is -L.
5. The shop's socket is red + N corresponds to the middle of the insert, black - L corresponds to the outer ring. Plug is blue + N corresponds to the middle hole, brown - L corresponds to the outer ring of metal.
6. Remember not to look at the same colour on the colour to colour connection. It is very likely that because of the positive and negative colours of the opposite trigger equipment burnt out or safety accidents! If you do not follow the precautions, do not understand the circuit operation caused by improper equipment damage or safety accidents. The shop is not responsible! (Emphasis added! If due to the wiring process is not good, leaving poor contact or copper wire broken section of the hidden trouble, may lead to the use of 1-2 times triggered by the phenomenon of burnout.)
7. When using a multimeter, please use a strict test to distinguish between the old accessories, batteries or chargers you originally want to change the positive and negative poles are the same as the positive and negative poles of our products or the opposite and then wired.

8. All the pictures are for reference only, the style will be updated at any time, sometimes with the picture will be a little different! But the same function does not affect the use, mind do not shoot, the pro wiring must be careful to distinguish, in order to prevent burning equipment!