How to squeeze 4 amps out of batteries?

Question

Batteries

I am designing a glowing costume for street circus performers. We want to use the WS2801 LED strip (addressable RGB LEDs, supply voltage 5V), the peculiarity of the strip is a rather high power consumption - about 1A per 1 meter. One suit needs 4 meters of tape. The question is, what is the best way to organize food? I'm considering four packs of 3 R20 batteries in parallel (i.e. 4.5V four packs in parallel), but are there better options? Or another tape with addressable LEDs, but with less consumption?
I invite you to discuss.

Answer 1

There are, for example, 18650 batteries that draw 5V up to 20-30 amperes. For vapers of electronic cigarettes, these devices have a wild demand and a small price in the region of 250 rubles.

Answer 2

Batteries tend to have much higher discharge currents than disposable batteries. The ability to deliver high currents is valued among fans of radio-controlled models, for example. This ability is denoted by index C. Here is an article on the topic: planetcalc.ru/2283
In some online stores, this c-rate is explicitly indicated.