3rd partt battery OR Sanyo for grip?

Finally, I've got the used 5d mkii, went from 50d. It has 3rd party battery grip and batteries. Since, I would need 4 more batteries, should I go 3rd party batteries or 8 Sanyo AAs? (I know oem canon is good but too much money for now...). I already have charger and 4 AAs for flash. Which one will last longer? I know 3rd party batteries are not reliable....

Also, 5d mkii has very chuncky, metal sound... is it broken or something? (I hope not...). I might bring it to local camera dealers to see....

Please let me know your opinions!

Why would you use AA batteries in a camera? I know they include a tray, but I've always thought of that as an emergency backup option. Just get a couple of batteries from a good vendor like SterlingTek. Lithium has a higher energy density than NiMh.

$14 on Amazon. http://www.amazon.com …ttery-2600/dp/B005DEHVC8/

Wasabi's are also really good 3rd party batteries. I also have some Canon and Flashpoint batteries, but I think the Wasabi's are better then the other two.

It's not the third party batteries that are not reliable, it's the counterfeit batteries that are the problem batteries.