So true. However, I did get a 303 532nm laser awhile back that came with an UltraFire battery. Just to see how bad it was I put it on my Opus and ran it through the whole gamut. It wasn't nearly as bad as I thought. It wasn't a 5000 mAh like claimed, but it was half that with an internal resistance of 150 mohm. Must have mistakenly put a decent battery in it.