Return those and get these.
http://www.buy.com/prod/sunpak-acc-...le-battery-bulk-pack/q/loc/111/202883001.html
$15 (after Google Checkout) for 20 rechargeables, 2650 mAh. Beset deal I could find, there's also this site:
http://www.all-battery.com/?engine=adwords!6040&keyword=*rechargeable+battery*&match_type=content
Which has some good deals. But it looks like they raised the price a little.
I got the Sunpak's and they are awesome. Buying name-brand rechargeables from retail is rape. I have enough rechargeables for my 3 wavebirds, 4 360 controllers and my 3 Wiimotes. and plenty more on reserve.
They are, for whatever reason, ever so slightly longer than my other rechargeables (like less than 1mm). They wouldn't fit in my DVD remote. That doen't matter, I use them for my gaming.
Oh yea, you'll also need a charger if you don't already have one. The longer the charge, less wear on the batteries, which in turn equals more battery charges. A lot of chargers you find are "quick charge" which isn't that great for battery life, but if you need batteries quick they're good. I have a 5 hour one which works nicely. Make sure it's a smart charger, so it shuts off by itself. As long as it's a Ni-MH charger you can use them for all Ni-MH rechargeables.