What is the difference between the older rechargeble batteries (Hero4) and the newer "blue trimmed" batteries (Hero 8)? A camera message tells me to "Use the Hero 8 battery for more features", but I cannot find where it makes a difference. Specs online seem the same. Hero 8 seems to work fine with the older batteries. Since I have three, don't want to trash them.
HERO4 and older cameras have different size.
HERO5 - 8Black have the same battery size.
For more information about HERO8 Battery please visit this website: https://community.gopro.com/t5/en/HERO8-Black-Battery-Compatibility/ta-p/398667