Led Flashlight with Super capacitors V2

[MarkE]

I bought on eBay LM2596 for US $2.47

http://www.ebay.com/itm/400802470941?_trksid=p2057872.m2749.l2649

There is a lot of product on the market and a lot of it works rather well.  The 93% they get is because they are operating in a particularly convenient voltage range for both the input and output.  For driving LEDs you want to control the output current.  The 2596 is designed to control the output voltage.

[dinoth]

I will use it to make charger for my flashlight   

[MarkE]

I will use it to make charger for my flashlight   

You want a current limited voltage source to charge your capacitors.

[dinoth]

Of course, 2.5 volt 2 amp

[MarkE]

The 2596 ahs internal protection against overcurrent, but it does not have a rectangular current limit function.  You might want to go with a board based on a different IC that does implement rectangular current limiting.