Q: Where can I get rechargeable CR123 batteries for the SteriPEN?
A: You essentially have two options: You may purchase a custom 'long', dual-RCR123 battery from us, or two single RCR123 batteries from a 3rd-party retailer.
The SteriPEN is a high-power device, and some RCR123 batteries are just not up to the challenge. A retailer may say that their battery has one-hundred-million-billion mAh (essentially the size of the battery's "gas tank") for as much as the change in your pocket. Who knows? That battery may live up to their claims for the SteriPEN; perhaps only for a low power device, like a flashlight; perhaps it just completely bogus.
We do have one recommendation for a 3rd-party RCR123 battery, and that is by 'AW'. This battery has been peer-reviewed, has been personally tested on my laboratory-grade battery analyzer, and in a SteriPEN. One retailer that has this battery is [http://www.foursevens.com/product_info.php?products_id=201]. This battery may be charged with a 3rd-party RCR123 charger, or with our SteriPEN Solar Charger.