5D Classic always low battery

[werdn]

I have a early production 5D Classic (original owner), and the battery display always shows low battery, even thought the battery is fully charged and can be used for many hours. Sometimes it shows up as fully charged, sometimes it shows up as low battery (one bar). This happens on three of my batteries. 

Do you guys think that it is becasue I need a new battery, or is the the camera's problem? Thanks in advance!

[Waddizzle]

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@Peter wrote:

Estimated recoverable capacity

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@werdn wrote:

Yeah, I think it might be a battery problem. Haha, I have had my batteries since 2006! I am going to try out one new battery first. Should I get a OE Canon one, or are third party ones OK? Also, should I get 1390mAh (original capacity) ones, or some 2000mAh ones I see on amazon?

Thanks!

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A lithium ion battery stored at 40% of charge at 25 degrees Celsius will have an estimated recoverable capacity of 96% one year later. Stored at 100% of charge it will have an estimated recoverable capacity of 80% after one year. After 14 years there will not be much left.

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Good point.  You make me suspect that the Dr. Watson batteries might be more recently manufactured. But, I would still want one Canon battery, anyway.