Magcharger rechargable flashlight system v4 already own a mag charger flashlight nicd battery pack has been superseded by new environmentally friendly nimh battery pack nimh battery pack has 34 more storage capacity then the nicd battery pack it replaced requires full charge cycle the new nimh accessory battery pack arxx235 is a true drop in solution it will work with any and every mag charger flashlight and charger regardless of when they were made features easily