Rapid (CHAdeMO) charging heats the traction battery, which if done a lot, isn't good for it -- but it doesn't eat the battery. Driving faster than around 50 mph also heats the battery, and you may do rather more of that.
The 12V battery charges all the time when the big traction battery is in use, both driving (in what Nissan call Ready state, the equivalent of having the engine running in a petrol car) and charging with either power inlet. It charges for a few minutes every day if the car's Off for long enough, and is supposed to charge if the voltage drops while On but not ready to drive.
(Comments based on the Nissan e-NV200, minivan younger sister to the original LEAF - but there's not a lot of difference between them at this level of description. The van has a feeble battery cooler, which the car lacks.)