How many hours can a 12V 7Ah battery 20W bulb last

aiqinghai111
12v7 battery with 20W bulb, can use 4 ~ 4.5 hours, how to get it?
First of all, the discharge current I = w / v = 20W / 13V = 20W / 13V = 1.54a (approximately equivalent), according to the discharge time = battery capacity / discharge current, we get
7Ah / 1.54a = 4.54 hours, the reason is about 4 ~ 4.5 hours, because this is the theoretical calculation of the discharge time, the actual discharge will be longer or shorter, but generally speaking, it is within this range

How to define the battery size of electric vehicles

The size of a battery car is defined in this way. Generally, a 12V battery can provide how much power in an hour to judge the size of the battery. Now, all the batteries are 12V, and the sizes are. 10a, 12a, 14a, 16a, 18a, 20A. In this case, what they can provide respectively is. The battery car generally has four batteries, Series connection is to provide. 48 * 10.48 * 12.48 * 14.48 * 16.48 * 18.48 * 20 electric power. In an ideal situation, if the power of a motor is 100%, the running time is. 48 * 10 / 350.48 * 12 / 350.48 * 14 / 350.48 * 16 / 350.48 * 18 / 350.48 * 20 / 350 for 350W motor

6V, 4.5ah above battery
How much voltage and current does the battery charger use to charge? Can the battery charge normally?

Buy a special battery charger, your battery is six volts, and the discharge can last for 4.5 hours if the charge is one ampere per hour

What is the internal resistance of 6V 4ah / 20HR battery?

Different manufacturers are not exactly the same, about 25m Ω

How many hours can a 12V 7Ah battery 20W bulb last