Have a very small pen light that runs on one AAA cell is there any parts I can order to boost the performance
What’s the brand and model of the AAA pen light?
What kind of performance improvements do you want? Brighter? Last longer?
To be honest I don’t think it’s worth the cost or the hassle involved. An AAA penlight is never going to be very powerful, as it’s not really meant to be - more for a quick flash of light.
Just buy a new one that is more suited to your needs. Pen light parts aren’t that readily available and I doubt it would make a whole lot of difference after you’d spent $20 messing around with it, you may even end up with it not working at all (if unlucky).
I have a Thorfire PF04 which is good - 210 lumens - may be worth looking at that.