Let's see.....
IC3 Charger and 4 AAA batteries:
Total cost: $45
(Batteries can be charged 1000 times.)
1000 X 4 "AAA" Alkalines (@$3 for 4 pack):
Total cost: $3000
The power consumption isn't even noticable on your (parent's) power bill. Besides, they pay that don't they?