proper storage of NiMH packs

[shizzon]

Hello all i just bought my first NiMH packs for My E-revo to hold me over until i make enough to go brushless, and i figure once i do go ill still be able to use them in my vxl'd slash, how should i store the packs (full charge/ half charge etc..). I'm not looking to store them too long without use if it makes a difference, a few days at most.

Thanks!!!