You're talking about this text, right?
"This servo can produce high-current draw from your batteries. If using NiMH or LiPo batteries, make sure they are capable of delivering sufficient amps."

They've had this warning for a while, and it seems to cause significant amounts of undue concern. I can only guess that they put it there because some people tried using lower capacity NiMH batteries and had problems. I typically use 1500 mah or higher NiMH packs and they've got more than enough capacity for the typical number of standard servos.