Justsumstuff, the laser requires 2 energizer 357 batteries, available for $4.99 each or 3 for $7 at my local walgreens. Found a 5 pack online for 5 bucks on amazon too. On the BG, EAAxxxx is the 1st serial number set. I picked mine up 3 weeks ago, and its a EAHxxxx. Also, anyone having...