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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 12 Dec 2009 (Saturday) 16:19
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Help! Canon 580EX II batteries overheating?

The ­ Fox
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Joined Jul 2007
Location: Huntington Beach, Ca
Dec 03, 2012 23:01 |  #31

Lithium batteries get more internal resistance as they discharge and this will cause them to get extremely warm. It only happens near the end but that do get hot. I dont use lithium batteries that are non rechargeable in anything for this reason.


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Dec 04, 2012 22:26 |  #32

This is weird. I used Energizer lithiums exclusively with all my 580EXII speedlights and yes, they got really hot (almost burn-your-hand-hot) but the flashes never stopped working. Now I use all 600EX-RT speedlights and I only use the best Eneloop rechargeable batteries. I've not noticed any problems with the batteries overheating but I have had quite a few instances of the flash overheating (which, again, I never had with any 5-series Canon speedlight, using lithiums).

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Aug 09, 2015 10:09 |  #33

Had the same problem last night shooting a wedding and wedding reception. No luxury there of giving my Canon 580 ExII a rest. Having read a few posts re batteries, two of us, each with different Speedlites, (the other is Nikon, but not ExII) chose alkaline high performance batteries. Mine still heated up, while my fellow photographer's did not. My solution that I stumbled upon, was having two sets of batteries. When one set heated up (so hot I couldn't hold them), I switched to the other set that had cooled down. I won't wait until they're that hot in the future. Can't be good for the camera. The second set of batteries, once cool, worked fine. So there may be something with the EXII that heats up batteries more than other Speedlite models. Curious about the 600 series, if they solved this problem.

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Help! Canon 580EX II batteries overheating?
FORUMS General Gear Talk Flash and Studio Lighting 
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