Overcharging. Each battery is designed for a certain voltage (usually 4.2 volts), but if you leave it to charge any longer, the pressure will start to build up. This will most likely result in an explosion. This is theoretically possible, but is unlikely to happen in practice, because all batteries today have a BMS (Battery Management System) board installed, which makes overcharging impossible. The board monitors the voltage on each individual cell of the battery and forcibly disconnects the charge when the battery is charged.
BMS and overcharge protection are present in every device today. When colombia number data your smartphone has been on charge for two days in a row, it has actually stopped charging for a long time because the board has done its job.
when charging gadgets. First, you shouldn't use chargers of unknown origin: ideally, it's better to charge with a family member. Second, while charging, it's not recommended, if we're talking about smartphones, to run programs and games on them that put a significant strain on the battery.
Internal short circuit. This risk is related to the technology of battery production and is based on the theoretical possibility of a short circuit between the anode and cathode inside the battery. The usual design involves a special separator that separates the anode and cathode. Together with the entire battery structure, they are filled with electrolyte.
If something goes wrong with the separator, for example, it becomes thinner or breaks, a short circuit, heating of the electrolyte and fire can occur.