EN-EL15a vs. EN-EL15 in D500... really a big difference?

For those shooting with a D500 and may have experience shooting both the 15a and 15 Nikon batteries, is there really a big, noticeable difference with the newer 15a batteries? I have four 15s, but notice when shooting video that LiveView realllllly drains the batteries quickly; I might be able to get 30-40 mins of continuous LiveView use. It's quite a bit better using the same batteries in my D750.

I am using mixture of 15 and 15a on recently acquired D500 like you described. I don't use liveview but noticed my battery drains a lot faster than

when it was used with D800 & D7200. Usually battery last long for fullday/3 dives but I could only do 2 dives with D500.

I took my camera and batteries to local Nikon service center and find camera is working fine but I had wi-fi/Blutooth function on for wireless file transfer

and that was main cause of fast battery consumption. They said camera is looking for my other bluetooth device(which is my cell phone) in full speed

and drains battery.

Ever since, I am using 15a as main battery & 15s just as a backup and make sure I turn off wi-fi/Bluetooth before I go dive.

Sam

I have a Nikon original 15 and a Nikon 15a. They seem equal. The bluetooth is a pain. It doesn't follow directions, giving me the on message when I turn off the camera even after I've changed the settings to off. My camera lasts fine underwater but drains the battery when it's off and in my camera bag between dive weekends. Even after update, my Nikon snapbridge doesn't work well with my i-phone. Works fine, then doesn't work at all. Doesn't turn on and off when told.