I recenty bought 2 green 250mw lasers,one comes with a 16340 battery and the other comes with a 18650 battery. the descriptions given didnt say if they came with battery chargers or not (i'm assuming not.) does anyonr konw of a U.S equivelant battery I could use temporarily until I can order the charger(s) and do I need 2 seperate chargers or is there a charger that can handle both? I havent recieved the lasers yet,should be delivered some time in the next week. the operating voltage listed was 3v to 4.7v. thanks for any advice.