10w charging 4000mah takes 190 to 240 minutes.
Battery charging refers to the working process in which the battery receives electrical energy from the external circuit and converts it into the chemical energy of the battery. After the battery energy is consumed by discharge, it can be restored by charging, and it can be re-discharged to form a charge discharge cycle. Charge with DC current. In different cases, different charging methods are used, such as constant current charging, constant voltage charging, floating charging, trickle charging, rapid charging or the combination of these methods.
The length of charging time and the power output of the charging head have a certain relationship, if we choose now on the market, the largest output power of a style is 40 watts fast charge as an example. It takes less than an hour to fully charge a 4,000mah battery, and if you want to fully charge 100,000 mah, it takes about 25 hours, that is, one day and night. Then if you choose a smaller, 27w fast charge, it will take a day and a half.
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