Slate Wands

I have a couple of old slate wands in my locker. I wonder if these are rechargeable. 

>analyze wand
You analyze your slate wand and sense that the item is free from merchant alteration restrictions.
You get no sense of whether or not the wand may be further lightened.
>analyze other wand
You analyze your slate wand and sense that the item is free from merchant alteration restrictions.
You get no sense of whether or not the wand may be further lightened.
>pre 405
You gesture and invoke the powers of the elements for the Elemental Detection spell…
Your spell is ready.
>cast at wand
You gesture at a slate wand.
The essence swirls as it flows in a fog of chaotic patterns around the wand.
Cast Roundtime 3 Seconds.
(Forcing stance down to guarded)
>pre 405
You gesture and invoke the powers of the elements for the Elemental Detection spell…
Your spell is ready.
>cast at other wand
You gesture at a slate wand.
The essence swirls as it flows in a fog of chaotic patterns around the wand.
Cast Roundtime 3 Seconds.

They don’t play nice with 405 like a Thanot Wand so I don’t know how many charges they have.

>cast at wand
You gesture at a pale thanot wand.
You sense that the wand is a magic item that holds the spell “Limb Disruption” with a fair amount of charges.
Cast Roundtime 3 Seconds.