There is some information
here on the topic
It stays on topic about as well as most CD threads do, but has a few tidbits of useful information.
One addition about he Werkers, they get hot when charging and never seem to reach a full charge. Not scary hot, but noticeably warm to the touch. I would not reccomend them for use by any team. We have had nothing but good luck with the Enersys and will continue to use them.