The batteries in the controllers run down surprisingly quickly in standby; in fact, they feel like they discharge faster when not in use.
I recently put away the controllers both at over 50% charge, didn't touch them for over 24 hours, and now both controllers need to be charged before they can be used.
Is there a method to turn the controllers off when putting them away? Should I leave them hooked up to a charger overnight so they're ready to go in the morning?
I wonder if they're turning up the power on the Bluetooth radio, attempting to connect to the headset (which is also off), and thus using more power than normal.
At this point, I'm not certain that an integrated battery is superior to using rechargeable AA batteries; when they're flat, I could swap the flat battery with a fully charged one, and I'm immediately ready to go.
I guess with a fleet of headsets, it's less of an issue, as it appears that you should be able to buy a pool of extra controllers (and batteries) to be recharged, grab a freshly charged set of controllers and swap them for the controllers that have gone flat, possibly at the same time as swapping out the battery in the headset.
I guess that I could buy a second set of controllers and swap them with the ones in active use as they go flat... but having them hooked up to the charger at 100% for days on end doesn't sound like a recipe for long-term battery health.