Charging at home will be a safety risk. Since the lithium battery of electric vehicles is full of materials that are easy to explode and burn, once the lithium battery is overcharged or there are combustibles around it, it will easily explode and catch fire after thermal runaway.
Lithium batteries are more likely to explode than lead-acid batteries. Continuously charging the battery without protective measures will pose a great safety hazard.
Especially now that the weather is hot, or the ambient temperature used is relatively high, it will also cause some organic substances inside the battery to melt and shrink, resulting in a short circuit between the positive and negative electrodes of the battery, which will eventually cause the battery to burn and explode. Combustibles and oxygen are available. Therefore, after the lithium battery catches fire, it will "burn more and more vigorously". It cannot be extinguished with ordinary dry powder fire extinguishers. It can only be extinguished with a large amount of water.
Lithium batteries can generally be charged and discharged 300-500 times. It is best to partially discharge a lithium battery rather than fully discharge it, and try to avoid frequent full discharges.
Once the batteries are off the production line, the clock starts to run. Lithium batteries only last a few years, whether you use them or not. The decrease in battery capacity is due to an increase in internal resistance caused by oxidation (which is the main reason for the decrease in battery capacity). Eventually, the cell resistance reaches a point where, although the battery is fully charged, the battery cannot discharge the stored charge.
A charging cycle means that the battery is fully charged from full to empty, and then from empty to full, which is not equivalent to charging once.
For example, a lithium battery is only half charged on the first day, and then fully charged. If it's still the same the next day, that's half of the charge, for a total of two charges, which counts as one charge cycle, not two.
Therefore, it may usually take several charges to complete a cycle. Each time a charge cycle is completed, the battery capacity decreases a little. However, this reduction in power is very small, and a high-quality battery will still retain its original capacity after being charged for many cycles.
80%, many lithium battery-powered products are still used as usual after two or three years. Of course, the lithium battery still needs to be replaced after the end of its life.