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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 30 Jan 2014 (Thursday) 13:00
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Question about CP-E4 battery pack.

Senior Member
317 posts
Joined Jun 2012
Location: DC/VA
Jan 30, 2014 13:00 |  #1

Hi All,

When using a battery pack (CP-E4 or the knockoffs) on your speedlight, will the 4 batteris in the speedlight also be used? I guess my questions is, will it be like having 12 batteries in the speedlight (4 in speedlight, and 8 external) or is just using the 8 batteries in the battery pack?


5D MkIII x2 + a lot of L's.​nRazaviPhotography (external link)

1,719 posts
Likes: 53
Joined Dec 2011
Location: Yorkshire, England
Jan 30, 2014 13:11 |  #2

Yes, the batteries inside the flash unit itself are used to drive the display, the zoom motor, ETTL, etc. The ONLY thing which the external battery pack does is to charge the capacitors directly, without passing through the normal circuitry inside your flash unit. This applies to almost all makes of flash and almost all makes of battery pack. The only ones of which I am aware which do not need batteries inside the flash are the current Metz flashguns.

Your flashgun won't work without the 4 internal batteries.

Phil ǁ Kershaw Soho Reflex: 4¼" Ross Xpres, 6½" Aldis, Super XX/ABC Pyro in 24 DDS, HP3/Meritol Metol in RFH, Johnson 'Scales' brand flash powder. Kodak Duo Six-20/Verichrome Pan. Other odd bits over the decades, simply to get the job done - not merely to polish and brag about cos I'm too mean to buy the polish!
FlickR (external link) ◄► "The Other Yongnuo User Guide v4.12" by Clive Bolton (external link) ◄► UK Railway Photographs 1906-79 (external link)

Cream of the Crop
6,686 posts
Gallery: 6 photos
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Joined Sep 2010
Location: Silver Spring, MD
Jan 31, 2014 08:24 |  #3

Depending on flash, I think one is able to set it so that the batteries in the flash also recharge the capacitors along with the external pack or not, if desired.

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Cream of the Crop
12,014 posts
Gallery: 4 photos
Likes: 277
Joined Nov 2007
Location: Traryd, Sweden
Feb 01, 2014 08:15 as a reply to  @ JakAHearts's post |  #4

Yes, you can choose with a C.Fn.


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Question about CP-E4 battery pack.
FORUMS General Gear Talk Flash and Studio Lighting 
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