Basic question about flash battery packs

Registered: Nov 29, 2008
Total Posts: 293
Country: Germany

Hi forum,

I want to buy a bp for my 580EX II and would like to know if there is any difference
in functionality and safety between the genuine battery packs (CP-E4) and the cheaper
off brand ones? The overheating protection should work regardless of the attached battery,


Registered: Mar 22, 2009
Total Posts: 670
Country: United States

I have two non CP-E4 battery packs for my two 580 EX IIs and they are working flawlessly.