Hello battery modification methods are as follows: Remove the screws above and below the battery box, pull out the battery core, the thickest red and blue two wires are the positive and negative electrodes of charge and discharge, according to the positive and negative electrodes connected with a charging port, and now generally supplies the word port, the pile of thin wires do not need to tube, the four thin wires alone are pulled out, anyway, after the change did not want to change electricity, remember to buy a matching charger on the line.