charging 2 7c packs on eos 0606i

[starscream27]

Hi,
I bought the eos0606i to charge my 2 7c elite 5000mah NiMh packs. I'm running them on a Y connecter and the first charge seemed to go well but took a while. so on my next charge i decided to charge them one at a time. this took longer . So now needless to say i'm going to be charging both packs at the same time from now on. Which brings me to my question, seeing as how i charged the batts olny once one at a time would it be safe to charge them both at the same time again? Just looking for a little reassurance.
Thanks