Not Your Everyday Banana

by Bart Arondson

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I have a 5DMIII with battery grip (by Canon) and Canon batteries. Since a few days ago, I noticed that, all of the sudden, if I leave the camera unused for, say, one day and turned off, when I turn it on, it won't.

I have to change batteries and everything is fine. The batteries that were in the camera seem to have died out because the led of the battery charger blinks once every second.

So I'm not quite sure if the issue is battery (all of them?) or the camera.

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Are they Canon OEM batteries? OFf brand? How many do you use or have you tried? How old are they? Have you bought a new one to test? Do you have another camera to test them in? Are you using the GPS adapter or any grips? –  dpollitt Aug 20 '13 at 2:24
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I have original OEM batteries. Both batteries and camera are 5 months old. And I'm not using GPS. –  Bob Aug 20 '13 at 2:29
    
@dpollitt - he specifically mentioned they are Canon batteries and that he is using a Canon battery grip. He also said that changing batteries made it work. It sounds like that were in the grip simply died. –  AJ Henderson Aug 20 '13 at 2:29
    
@AJHenderson - Yeah I get it. I wanted to specifically call it out as not all people realize that you can buy different branded batteries for cameras, and they simply call them "Canon" when they aren't actually. He already clarified my question in a comment, so we are all good on that now. –  dpollitt Aug 20 '13 at 2:31
    
@dpollitt - true, I guess I just expected that since he specifically mentioned (by Canon) that he actually knew what he was saying, but I understand the desire to clarify. –  AJ Henderson Aug 20 '13 at 2:32
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6 Answers 6

According to the guys at Magic Lantern, when you open the SD card door and the light flashes while it accesses the SD card, you should wait until several seconds after the light stops flashing as it is still accessing the card (which is silly, because that light has one job!) or you can cause the camera to lock up and drain the battery.

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I've had this several times on a Mk II. Can cause exactly what Bob described. There is nothing left in the batteries at all, the camera will not turn on. As to why the light doesn't keep flashing, that might be a limitation of the ML firmware. I would assume it's not how Canon programmed it to work. –  mivilar Dec 24 '13 at 1:56
    
The problem is not specific to ML, but they are the only ones that I've seen identify the issue. I had a similar thing happen to me (without having ever used ML) and the people from ML had an answer. –  tenmiles Dec 24 '13 at 2:27
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I don't know if it's exactly the same thing, but earlier in October, Canon released a product advisory for their LP-E6 batteries and the LC-E6 charger.

Full details can be found here.

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How long have you left them on the charger? From completely dead, it can take quite a while to charge the batteries. I would leave the batteries on the charger for 8+ hours and then try them in the camera by itself, without the grip. If they don't work and other batteries do work in the camera, then it sounds like a dead battery.

Another option you could try is to go to the battery info screen on the third page of the gear shaped menu section. It will give you an exact % of battery left. You can then take the battery out and see if it loses charge on it's own or only when in the camera. If it loses power while the camera is off and only in the camera, sounds like a short somewhere. If it loses power while out of the camera and sitting by itself, it's probably a damaged battery, though if a lot of batteries suddenly developed the same problem, there's a good chance something in the grip or camera caused them to become damaged.

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I keep them on charge till I see the led blinking green. It typically takes about 2.5 hours. –  Bob Aug 20 '13 at 2:30
    
@Bob - what charger are you using. My 5d mark3's charger goes to a solid green light when they are charged. –  AJ Henderson Aug 20 '13 at 2:31
    
I'm using Canon charger, and it does go to solid green in about 2.5hrs –  Bob Aug 20 '13 at 2:34
    
@Bob - want to jump in chat real quick so we can have a more interactive discussion about it –  AJ Henderson Aug 20 '13 at 2:35
    
and I must say this is very recent. Till a week ago everything was just fine in terms of battery life.. –  Bob Aug 20 '13 at 2:35
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The problem with battery life in a lot of Canon cameras is that the batteries can be rated at 750mAh and the camera at 1000mAh. Even though the voltage is the same, your battery won't last as long as one rated at the same as your camera. Usually the rating is on the sticker on the bottom of the camera or in the manual.

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Same thing happened to me after I got my 5D MKIII.

2 things to check here:

1.) Make sure your on the latest firmware.

2.) Camera settings, under the wrench icon, second position: Auto Power off. Set that to 1 min.

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Here's another data point. My wife's Canon 7D started draining the batteries. (Around the same time it also started reporting that it couldn't communicate with the battery, so this may be a different situation.) We lived with it for awhile since we didn't want to send it to Canon and just made sure we always had fresh batteries when going out for a shoot.

Eventually, we stopped by the local camera shop where it refused to behave like that, but he upgraded the camera's firmware anyhow. From that moment on it recognized all batteries and stopped draining them.

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