18650 Battery Ainsworth Kohler November 08, 2016 11:14 Updated Follow Q: Can I use the 18650 battery in the Adventurer opti / Traveler mini / ... A: No. Although the 18650 battery has approximately the same dimensions of two CR123 batteries, a single 18650 battery only has half the voltage of two CR123 batteries. Related articles Rechargeable CR123s What batteries do SteriPENs take? My SteriPEN has an internal lithium-ion battery. How should I store it? Inserting Batteries into the Classic USB Charger Comments 0 comments Please sign in to leave a comment.