http://www.bushcraftuk.net/community/showthread.php?t=316&highlight=wire Stuart is a mod @ Bushcraft and designed this latest version. It would be best to ask him. My version is the earlier unit with swivels and split rings. Battery life should always be measured by use. Lets go on the 72 hour to rescue average. Remember perhaps 24 hours will be devoted to sleep and 36 are daylight. That leaves 12 hours of twilight, dawn and midnight latrine visits. So, unless your navigating by night or performing an urgent task the photon has a fair life with carefull conservation. The medical professionals on the forum have stated in many threads that Betadine etc. may actually be counterproductive and simply flushing with clean water is effective. Remember the first rule of first aid "Do no harm." I carry some basic antibiotics and both aspirin and non aspirin pain meds ( remember the dangers to young children.) and Martin's Burn away.