I've been really happy with my refill method.
I use the condom method, then spin, then dip it in the condom again to top it off, then spin it once more before capping. This seems to keep the gurglies at bay, and the carts last a good while. Once they're all filled, they sit for at least 12 hours battery end down in a box before I use one just to further let them "settle."
I use the condom method, then spin, then dip it in the condom again to top it off, then spin it once more before capping. This seems to keep the gurglies at bay, and the carts last a good while. Once they're all filled, they sit for at least 12 hours battery end down in a box before I use one just to further let them "settle."