The new version is manually modified in the factory, so it may contain traces of glue, such as in the sensor, as each one is tested manually to ensure product quality. It may also have other imperfections in the solder joints. Although it may appear repaired, it is not. It is a completely new product. Common Problems and Solutions: 1- BMS does not turn on. Check that the balancing flex and all cells are above 3v. 2- Not charging/No blue light. Check all temperature sensors shown in the product description images. 3- Solid blue light. The BMS is detecting excessive cell imbalance or the cells are overcharged. Installation: This BMS is a fully compatible and improved version of the original, so it must be replaced entirely, as the electronics in the strip are designed to measure the battery differently from the original. It does not have fuses, but they have been replaced by a discharge control system which automatically disconnects in case of a short circuit or excessive temperature at the output.