Rechargeable batteries for Steripen Opti

You can use CR-123R protected or not. Protection generally refers to the charge/disharge/overcharge type situations. I don't believe you can buy un-protected batteries, except smaller ones. The three volt cells will work, but only at about 1/3 the rate of a standard CR-123 battery or about 1/5 the rate of a CR-123A. They do not hold a charge for very long, either.

I tried 3 sets on an outing several years ago. All were unusable at the end of a week. One set was not even used in the Adventurer. It looks like the device actualy wants a nearly full, rechargable battery to function. Even though a bit over half the charge is still in the batteries, without the little extra voltage a fully re-charged battery produces, it will not trigger the UV bulb. Alkaline batteries have a bit more voltage, so, they run down but still produce an acceptable voltage for the UV bulb. You likely won't get more than 8 recharge cycles out of them in the Adventurer, so, they don't even pay for themselves. Though, they still work in the camera/strobe. The UV device is real touchy as far as batteries, go. You are better off sticking with the alkiline batteries, is what I found…for service (number of cycles,) storage (they don't degrade nearly as fast) and weight (alkaline batteries are lighter than rechargables.) I have NOT found any Li in that size, so I have not tried those, yet.