Research indicates that the optimal charge rate of the battery is between 40 and 80 percent, which will provide the opportunity to get the most out of the battery, where charging batteries to 100 percent is one of the factors that lead to damage, according to the site "Arab".
Most smart phone batteries, tablets, and laptops are made of high-quality Lithium-ion or lithium-polymer, and overcharging may damage them.
As for laptops, these batteries have a limited number of charge and discharge cycles, so if you let the battery run out of charging frequently, this affects the discharge cycle and reduces its shelf life, which is why try to keep the battery charged to level 40 % at least.
Keeping your smartphone or tablet connected to the charger overnight may damage the device as the battery will gradually lose capacity with each charge cycle, and you'll notice a significant deterioration in your phone's battery capacity due to continuous discharge and recharge.
Keeping laptops connected at all times to charging can cause the battery to overheat, potentially causing fires, a rare but potentially dangerous risk.