Can I charge generic AA batteries through the Xbox one controller?

That would depend on the batteries. If they are standard AA batteries, recharagable or not, then they cannot be charged in the controller. Rechargable AA batteries need to be charged with an AA battery charger. The only battery that can be charged in the controller is the Xbox play and charge battery.

I have been using the regular reachargable AA batteries that come with the wireless x1 elite controller. It isnt the play and charge kit.[...]

The AA Batteries that came with my Elite controller are NON-rechargeable Duracell batteries.

If you are using rechargeable AA batteries, they will also NOT charge through the USB cable.

Only the specific battery pack of the Play and Charge kit can be charged via USB. If you look into the battery compartment, between the battery contacts, you should see three "golden" contacts. These are for the Play and Charge battery pack, and only those
contacts provide the charging capacity for the Play and Charge battery pack. No charging current is sent to the AA battery contacts, as the controller can't know if you inserted standard non-rechargeable AA batteries (which might explode if charged), or if
you are using rechargeable AA batteries.

Therefore it's not possible to charge AA batteries inside any Xbox One controller.

What type of batteries are you trying to charge? If it's rechargeable AA, then they cannot be charged in the controller. The only batteries that can be charged that way are the play and charge batteries. To charge AA batteries, you will need a separate
AA battery charger.

Hi Wolf!

The controller cannot charge standard AA batteries via a USB cable, nor can it charge rechargeable AA batteries.

Microsoft sell a
Play & Charge Kit that includes a battery pack which sits in place of the AA's and you can charge it up via the cable included. They last for ages and you can charge it whilst playing.

If you want to use rechargeable AA batteries with your controller you can, but they must be charged in the charging unit that came with the batteries, you cannot charge them in the controller via a USB cable. (I would not recommend trying it either)

Do not put regular AA batteries with the play n charge cable. It will most likely blow the batteries this way. You can only use rechargeable batteries that came with the play n charge cable, or other ones from another controller. Do not even use rechargeable
AA batteries with the play n charge kit as they will not charge through it.

You can use AA batteries in the battery pack that comes with controllers most of the time. But you cannot actually use the play n charge cable. Well you can, but it's dangerous. So take the AA batteries out before using the play n charge cable.

Also, you can have the play n charge player plugged in without any batteries, so if you want a wired connection, that'll work for you I believe.

I hope I answered your questions.