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After savaging most of the exterior, we aren't surprised to find the GoPro's battery soldered to the motherboard and glued into a bracket.

No more removable batteries—presumably in the interest of waterproofing.

The Hero4 Session packs a 3.8 V, 1000 mAh, 3.8 Wh battery, just about on par with the Hero 3+, and smaller than the 1160 mAh battery in the Hero4.

With an estimated two-hour battery life, you're going to be recharging often—increasing the number of charge cycles on your camera, and decreasing its life before you need to, but can't, replace the battery.