are you spamming for yotang if not then you should know that yotang has underpowered lasers if you dont want to spend a ton go with rayfoss and get a little lower power.
You could use one 10440 with a spacer! or take a chance by using two but they put out about 3.7 volts and might break your laser. they are the same size as a AAA if you use unprotected ones!