If you connect the battery directly to the TV, there will be no response at all. There is a simple reason. Dry batteries are formed by direct current, and televisions are powered by alternating current. These two power supplies are essentially different.

The 5th battery is connected in series to form direct current, and the transformer passing through the TV set has no output at all, so you can't see it.

What if DC and AC are not considered?

Regardless of DC and AC, only energy conversion is considered. If the ordinary battery is 1000 mAh, then many batteries are almost 220 watts, and the TV can consume 200 watts for about two hours.

In fact, DC to AC is not a big problem, because there are inverters.

Working principle of DC AC frequency converter;

Based on the principle of oscillator, DC power is first converted into pulse AC power with amplitude varying with time, and DC component is removed by DC isolation system, while AC component is retained. Then through the transformation system (boost or buck), the AC power supply that meets our needs is transformed, shaped and stabilized. An oscillating circuit is used to generate a pulsating DC current with a certain frequency, and then a transformer is used to convert this current into the required AC voltage. The three-phase inverter simultaneously generates a three-phase AC voltage with a phase angle of 65438 0.20 degrees.

Now there is an inverter, which solves the problem that DC and AC cannot be used directly.

But in addition, there is another problem that cannot be ignored, that is, current. In order to make TV work normally, current and voltage must meet the requirements at the same time. The current of normal TV broadcast is 0.8-1.0a. This current is far greater than the maximum current that the No.5 dry battery can bear.

The current supplied by No.5 dry cell to the load depends on the load resistance (I=U/R). The greater the load resistance, the smaller the current, and vice versa. However, the No.5 dry battery has a maximum allowable current, beyond which the dry battery will be easily damaged or its life will be shortened.

The life of a No.5 dry battery is related to the discharge current, that is, the load is related to the internal resistance of the battery (the internal resistance of the lithium battery can be ignored, but it cannot be ignored in the case of large current discharge). Most battery manufacturers do not provide the service time of No.5 dry battery, because the internal resistance of No.5 dry battery changes greatly during discharge, and it can recover a little after stopping discharge, so it is difficult to accurately judge the "end" time of discharge.

The maximum discharge current, i.e. short-circuit current, of No.5 dry battery is generally 100mA~200mA.

So the gap between 0.2A and 1.0A is still very large. Then if the current of 1.0 A passes through the No.5 dry battery, the whole battery will be scrapped immediately. Of course, the current is insufficient, and the TV can't work normally. Therefore, connecting these dry batteries together is effortless.