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How can I fix a "Cannot communicate with battery" error on Canon 7D? - Photography Stack Exchange
See just how many photos a Canon DSLR shoots before the shutter dies - DIY Photography
SOLVED: won't turn on even though battery charged - Canon EOS 7D - iFixit
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A Canon 7D Mark 1 issue – “Cannot communicate with battery” – Stephen Monro's blog
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Canon 7D Mark II torture test: See a shutter fail in real time: Digital Photography Review
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SOLVED: Canon 7D "will not communicate with battery": Canon EOS 7D / 10D - 90D Talk Forum: Digital Photography Review
A Canon 7D Mark 1 issue – “Cannot communicate with battery” – Stephen Monro's blog
Canon 7d wont turn on - YouTube
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My Canon EOS 5D Mark IV is asking if the inserted battery is original or not. What are the implications of my answer? - Photography Stack Exchange
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What is the solution to the following error on my Canon - Err06 sensor cleaning error? Its a 6D, and may not be worth to soend a lot of money fixing it. Any idea? - Quora
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Cannot Communicate With Battery | Reverting to Type
Canon EOS 7D Mark II DSLR Camera Body
Canon EOS 7D Battery Error (flashing battery icon) Fix — Bob M. Montgomery Images
Discussion - Camera Firmware Update Causes Third Party Batteries to Fail