2000mah is just average with AA cells but the more intriguing claim here is. Stays charged.
Yes but only if you have a decent charger getting them all cozy and well up to their maximum peak. Many old chargers would just tell you "full" at 80 percent and after 20 circles of loading and unloading the memory effect of the cell would kick in and whatever then might "stay charged" might have been only 900mah of the accliamed 2000mah.
So make sure you got good kit to charge 'em propperly