Re-Fuel 6hr Action Pack Battery for GoPro Hero4, Hero3+ & Hero3-6 Hour Extended Battery for GoPro Easily replaces your standard backdoor in just a few simple steps Shake to Read LED battery gauge/charging indicator for information at a glance IP68 rated to be waterproof and withstand dirt & dust A specially crafted battery allows the Action Pack to work in extreme cold & heat Compatible with any GoPro Hero 4, 3+ and 3