is that a go pro battery in the case that it runs off of? Can I use a go pro battery?

Yes it is a GoPro Battery..BUT..its the older type of battery..not the one that powers the the GoPro 5 and up...this battery is the one with the flat bottom.

Should I grease the silicone o-ring before using this for underwater?

Dear friend, Hello! No, You do not need take grease the silicone o-ring before using this for underwater.This Waterproof light We waterproof test 147ft(45m). You can rest assured that underwater use. If you have any questions please contact us! We would be happy serve you!

Anyone put this on a drone?

Dear friend, Hello! I'm very sorry to keep you waiting. The weight of this waterproof light is 4.28oz. You need to confirm that this weight can be supported on your drone. Please feel free to contact us if you have any questions, we will be happy to help you. Thank you for your support and trust. Thanks!

Will a GoPro Hero 5 battery work in this light ?

Dear friend, Hello! This waterproof light battery fit Gopro Hero 3/Hero 3+. It not fit Gopro hero 5 battery. If you have any questions please contact us! We would be happy serve you!

Has Self-Timer	No
Hardware Interface	USB
Water Resistance Level	Waterproof
Connectivity Technology	USB
Flash Modes Description	Flash
Battery Average Life	1.83 Hours
Item Dimensions L x W x H	2.95"L x 1.65"W x 2.76"H

High Power Dimmable Waterproof Led Video Light Fill Night Diving Underwater For Gopro Hero 13/Hero 12/Hero 11/Hero 10/9/8/7/6/5/4/3/2/Herosession/Dji Osmo/Insta 360/Akaso Action Cam

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