"A Laser mod is cheaper than a Tornado/Ego and replacement batteries (10440) are much cheaper. It hits harder than a 510 and lasts much longer. A good alternative if you want something small"
Just received my Laser today from Ikenvape. Your Joye 510 batts are around 150 mah for the manual, and 180 for auto. Mega batt for 510 is around 280 mah.
The sturdy built laser (for the price) runs a 10440 380mah battery, is sleek, stealthy, and performs excellent in comparison to a stock Joye batt.
My advice? Stick with the 3.7V and keep it simple. There are a lot of mods, high voltage, and slick stuff out there, and they are for the most part very good. For a minimum price you can step up to the next level and this product is solid for the money.
I know IkenVape just received another batch of Lasers and I've got a second one on the way. Grab the one with keychain and either remove it, or no. Take the chain off down to the the triangle peice that connects to the very end and you can wear this thing around your neck if you wish. The switch is very sturdy and takes some real pressure to activate. I think it would be very difficult to have it accidently go off while being placed in a jean pocket for instance.
Save your bucks and take the next baby step. It could be your last.