4.2 to 5 volt charger. The battery charger mainly depends on its charging voltage and current. The lithium battery is 1800 MAH, which is only 3.7 V. The output voltage of the charger can be 4.2 V to 5 V, and the output current can be 500 to 900 mA. charging time is 3-5 hours. It is fast and does not damage the battery or affect its lifespan.
1800 mah means if you draw 1800 mA per hour, it can only maintain power for one hour. If you use 180 mA per hour, it can be used for ten hours. The battery has its own resistance. the electrical appliances you use (such as Connect an 18 mAh LED light per hour to the battery to calculate the approximate consumption of time, which is 1800 mah - (power loss of LED light + power loss of resistor of battery) × time, because I don't know you The real power of the deviceselectrics used is, so it is impossible to calculate how much time you spend in this process (the time it takes to drain the battery).