580EX II + CP-E4 recycle times

I'm hoping to update my blog occasionally to consolidate various tidbits of information I have learned about photography into one location.

How fast can your 580EX II recycle a full power (1/1) shot?

• Alkaline batteries: ~3.6 seconds
• Sanyo Eneloop batteries (2000mAH NiMH): ~2.8 seconds
• Sanyo Eneloop batteries + CP-E4: ~1.0 seconds

The CP-E4 recharges your flash at a fast enough rate that you should be aware of the heat buildup in your flash head.