cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

CANNON EOS 7D get message as "cannot connect with battery" What can i do to fix this problem?

Modesto
Apprentice

 when i turn on the camera  and its trying to read the battery the message i get is " cannot connect with battery"  i thought it was a defective battery and went out and bought a new one and still kept getting the same message.  what can i do ? Does anybody been through this situation from what i hear this is common on the CANNON EOS 7D models only why is that?

6 REPLIES 6

Jessica
Enthusiast

Hi Modesto! So that the Community can help you better, we will need to know exactly what equipment you're using.  Any other details you'd like to give will also help the Community better understand your issue. Thanks and have a great day!

is this a bit more clear and percise to the issue or the problem

amfoto1
Whiz

I've been shooting with a pair of 7Ds for close to four years now and have never seen such a message. Nor have I heard of a problem such as you describe from any other 7D users (and I'm pretty active on some Internet forums). So, no, I don't think this is a common problem.

If the camera turns on, it must be getting power from the battery. So I am guessing it's just not able to read the on-board battery diagnostics, can't report the battery condition or shot details.

Is it an OEM Canon LP-E6 battery or a third party battery?

Is the battery (or the camera) new, used but new to you, or have you had them for a while and they worked correctly before?

If Canon battery and/or one you have used without problem in the past, I'd simply clean the battery to camera electronic contacts. Just use a few drops of isopropyl alcohol to dampen a clean rag and wipe the contacts lightly... both on the battery and inside the camera's battery compartment. Look closely, too, to be sure there is nothing obstructing any of the battery contacts.

Note: if you are using a Canon BG-E7 vertical grip, also remove that and clean the contacts on both the grip and up inside the camera's battery compartment. If you are using some third party battery grip, that might be the source of your problems. I have heard of issues when using those.

If the battery is old and has been recharged quite a bit, it may be worn out and need replacement.

The OEM Canon LP-E6 have a built-in chip that keeps some data about the battery, that can be read with the camera. Besides the little charge level indicator on the top LCD display, you also can go into the menu, to the third camera setup tab (yellow "wrench" with three dots), and you'll find "Battery info" as the first item. Press "Set" and you'll get information about the battery(ies) condition... charge level, number of shots taken, recharge "condition". Press "Info" and you'll see the battery(ies)'s serial number and the date it was last placed into the camera. You'll also be able to "register" (or delete) the battery from that screen. If the battery is not registered, it's info will be slightly grayed down. Register it now. The word "register" should be highlighted, if the battery is unregistered. All you have to do is press "Set" while on this screen, and the battery should then show registered in the camera (the serial number and date data brighten). Press "menu" to get out of the screen and back to the Battery Info screen. Registering the battery that might cure your problem if you are using OEM Canon LP-E6 batteries. However, some non-Canon batteries do not have the proper circuitry to be registered.

Yes! It is a factory defect and Canon should recall 7D and 60D for this problem in stead to charge $230 for their own quality issue. I have 7D and not using it that often, it shows the same error message. Cleaning can not fix it at all! It was the soldering bad point at the battery and the little circuit board next to it, based on an engineer who repaired it by himself. Canon pro's: If you guys are cate about the Name of Canon then take these cameras back and fix them for free! Otherwise, the customers will switch to Nikon soon.

MUSH
Apprentice

i have two eos 7d camera body and four GENUINE CANON LP-E6 BATTERIES. ihave changed them around but still get the same message that the camera cannot communicate with the battery, so i know its not a faulty battery. apparently there are dozens of people having the same problem, and not just with EOS 7D CAMERAS. I am off to Japan soon for three weeks and am worried that it could ruin what is an expensive holiday of a lifetime.  has anyone had this problem sorted and is it a simple repair, or a costly one ?

"... so i know its not a faulty battery ..."

 

Don't be too sure about this!

I have heard this rumor for a while now,...lately about the 7D.  Not in the beginning when I first bought my 7D.

Another rumor floating around is a bad batch of batteries and/or the "chip" inside them.

Of course the standard warning to never use off-brand batteries is a solid one, so guys have made the error go away with one.

Again just what I have heard as it does not effect mine.

EB
EOS 1DX and 1D Mk IV and several lenses!
Announcements
01/18/2023: New firmware version 1.1.1 is available for EOS R6 Mark II
01/09/2023: Help ensure your autofocus is properly aligned with a Canon Precision Alignment
01/03/2023: Welcome to CES 2023!
12/08/2022: New firmware version 1.0.5.1 is available for EOS C70
12/07/2022: New firmware version 1.7.0 is available for EOS R5
12/07/2022: New firmware version 1.7.0 is available for EOS R6
11/22/2022: New firmware available for EOS R3, EOS R7 and EOS R10
11/16/2022: We're thrilled to be ranked among the Best Employers for Veterans in 2022 by Forbes.
08/31/2022: New firmware version 1.1.1 is available for RF 70-200mm L IS USM
08/09/2022: New firmware version 1.2.0 is available for CR-N 300
08/09/2022: New firmware version 1.2.0 is available for CR-N 500
07/14/2022: New firmware version 1.0.1 is available for CR-X300
06/10/2022: Service Notice:UPDATE: Canon Inkjet Printer continuous reboot loop or powering down
06/07/2022: New firmware version 1.3.2 is available for PowerShot G7 X Mark III
05/31/2022: Did someone SAY Badges?
05/26/2022: New firmware version 1.0.5.1 is available for EOS-C500 Mark II
05/26/2022: New firmware version 1.0.3.1 is available for EOS-C300 Mark III
05/10/2022: Keep your Canon gear in optimal condition with a Canon Maintenance Service
05/05/2022: We are excited to announce that we have refreshed the ranking scale within the community!
04/26/2022: New firmware version 1.0.1.1 is available for EOS R5 C
03/23/2022: New firmware version 1.0.3.1 is available for EOS-C70
02/09/2022: Share Your Photos is back!
02/07/2022: New firmware version 1.6.1 is available for EOS-1DX Mark III
01/19/2022: READY FOR ANYTHING EOS-R5 C
01/13/2022: Community Update. We will be retiring the legacy profile avatars on 01/20/2022. Click this link to read more.