How do I increase the current a battery delivers? [closed]

Question

Let's say there's a 2Ah battery with a C rating of 2C. So this means that I could discharge 4 amperes for half an hour at best.

Now, there is a default current that we get from a battery right? How do I increase the current discharge for this particular battery? Is there a component I can attach to my battery?

Some sources said that the discharge increases depending on the appliance, and how much it requires, but if I take a lamp, I can pass less than the required current and although not as bright, it will still glow.

If this is true, and appliances can determine the current discharge of a battery, how would I change the amount of current an appliance takes?

Answer 1

There is no default current that you get from a battery. The current delivered by a battery is determined by its voltage and the resistance of the connected load.

A battery will have an internal resistance that will limit the maximum current the battery will deliver into a short circuit and will cause the apparent voltage of the battery to decrease with higher currents.

Answer 2

The C and discharge rate is limited by the battery internal resistance, which leads to heating during charge and discharge. If you add cooling to the battery it can sustain a higher discharge rate, but you should consult the manufacturer.

More about C and discharge rate here: https://batteryuniversity.com/article/bu-402-what-is-c-rate

That said, exceeding the recommended discharge rate for a Li-ion can damage the battery and possibly cause an explosion. Most Li-ion batteries sold to consumers have protection built in to prevent this. Nevertheless, there’s plenty of YouTube videos of Li-ion batteries gone wild (especially things like modded vape pens - go figure.)

If your load uses a lower voltage than the battery set, you can use a step-down regulator to increase the current. This lowers the discharge rate, so you could possibly get more run time, depending on the conversion efficiency.

Answer 3

Let's say there's a 2Ah battery with a C rating of 2C.

The above statement is incorrect.

The correct statement would be 'Let's say there's a C2 rated battery having a capacity of 2 Ah'. It would refer to a 2 Ah battery capable of delivering 1 A maximum for 2 hours without getting damaged.

Consider another example of a C20 rated battery having a capacity of 100 Ah. It would refer to a 100 Ah battery capable of delivering 5 A maximum for 20 hours without getting damaged.

It should be borne in mind that the rated capacity would not be fully available at higher discharge rates.

0.1 C or 0.5 C or 1 C refer to charge or discharge current. For example, charging a 100 Ah battery at 0.1 C would mean a charging current of 100 x 0.1 = 10A. Likewise for discharge current.

How do can I increase the current discharge for this particular battery?

The discharge current of a particular battery would be dependant on its voltage and the load resistance.