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So basically I need a smaller capacity battery? 

I modified the original bulb and mounted the led in place. It works I have tested with the battery just not for long without heating up the resistor. So should I go for a torch driver then? Is there anything else I can do?

I'm trying to convert a maglite torch to led and recgargable.  I have a 1w led 350ma I have a 5v battery. Led voltage drop is 3.4v I worked it out that it would need a 4.7ohm resistor. I connected everything up to the battery and the resistor got that hot that it melted the insulation.  Is...