The battery voltage is 36V or 48V, but the motor rated voltage is 24V. It has far exceeded the rated voltage. Direct power can burn the motor. A voltage stabilization module is required to reduce the voltage. Voltage stabilization modules are available on Taobao. A 100W module costs only a few tens of yuan. After purchasing it, simply connect the battery and adjust the output voltage with a voltmeter. Maximum current and power are absolutely no problem, and such a large battery can run several hundred watts. However, such a high-power DC motor can simply add a protection circuit and a starting circuit to prevent the motor from getting stuck, causing an overcurrent that would burn the motor, and to prevent the instantaneous current when starting the motor from 'affect battery life.
How long can a 3.7 lithium battery boost 12V to power a light?
No. Since the internal resistance of dry batteries and lithium batteries is different, ordinary batteries are larger. In order to maintain the same supply current, the internal resistances are added together when used together. However, the internal resistance is currently high for lithium. batteries and weak for dry batteries. Irregular discharge current causes the battery to heat up significantly, which may cause the battery to leak or explode.
If it is at room temperature, the power of 12V7AH is 12*7=84VAH, or 84WH 84WH divided by 5W=16.8 hours, or approximately 17 hours. But if it is 0 degrees, the quantity discharged will be much less. A better battery may discharge to over 85%, and a bad battery may discharge to around 50%. In other words, it takese 8.5 and 2 p.m. It depends on the battery performance at low temperatures.