Combo: Universal Smart Charger: 6v - 12v #01025 (Version 2) + 2 pcs 7.2V NiMH 3800mAh Battery Packs

Will these batteries connect to my Red Cat volcano plug? The plug is red and has and has two bigger round ends on it, I dont know what they are called

so how long dose it exactly take to charge the 3800mAh battery? the instructions are extremly vague. i wish i would have bought something else.

Are this waterproof or water resistant?

How long do these batteries last on a full charge and rapid charge?