To replace the batteries in your Life+Gear 41-3944 flashlight, you will need four LR41 button cell batteries. 1. Twist off the head of the flashlight. 2. Remove the internal rubber spacer and slide out the old batteries. 3. Ensure the internal spring is wide-side down. 4. Insert the four new batteries in the same direction, flat-side toward the spring. 5. Replace the rubber spacer (silver dot facing the batteries) and reassemble.