nop nintendo dosent recomend lithium i dont think, not sure, anyways they are NiMH (nickel metal hybrid) and they are good for infinit charges because for 12$ more i bought the lifetime waranty from The Source by Curcuit city (it was a radioshack, and the new name is gay to i call it radioshack still)
and that waranty covers the batteries too, so hehe, also i need to check the manual for who many charges u can do, but it says it never losses power as long as u us them frequently sorry g2g gona be late
I saw this on the other site and i'm so buying it
they also have rubbery battery cover(you have to change it to make it charge) which prevents it from getting out of hand