I just got my Anker 2x 1800 batteries and universal charger from amazon yesterday for my Samsung Fascinate running AOKP32glitchedv14. After opening the package, I immediately noticed how incredibly stupid this "universal" charger is. It was made in China but that's no excuse i've certainly gotten better chargers than this out of China. For example, before I figured out that the whole bottom half of the charger slides on springs. I had no idea!! The bottom half also rotates which is how most people probably think the battery is installed. Definitely not.
Anyways, after figuring the battery charger out I stuck one on the charger, plugged it in and noticed the LED doesn't display the correct colors when the tethered charge is plugged in as well. Whatever who cares stupid charger but it seems like you are required to use this thing to charge the batteries although I haven't confirmed.
The batteries themselves are some of the highest quality batteries I've ever seen come out of china. I'm still discharging the first one from yesterday and i'm still not close to running it dead. I left my device on idle all night with wifi on and sync on and it only used about 2-3% over the course of 7-8 hours I love it! I have a feeling these batteries are going to last 24hrs for me easily. I don't know about switching them and having the other discharge yet as I'm still trying to discharge the first lol