The Rescue Dan R.EXT continues to be available as a replacement battery.

R.EXT has been superseded by the R.EXT1 External light for survival crafts.  At half the size of the previous R.EXT model. The product is in two parts (battery and lamp) and provides more than 4.3cd in all directions for a minimum of 12 hours. There is an option for a specially-designed backing plate, which makes it easy to change batteries after five years shelf life. This backing plate can also be used for Internal light type Rescue Dan R.INT2.

Classified as Hazardous for Shipping Purposes – See PSDS