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Old Sep 17, 2008, 12:39 AM   #1
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Steve ~

Rechargable batteries in the proprietry form factors are big business and every shooter relies on them.

Some batteries, for example the OlympusLi-42B, Fuji NP-45, & Pentax D-LI63 (all the exact same battery),are advertised as 850, 1000or 1100 mAh while their OEM counterparts are only 740 mAh.

I'veencountered instances where 1000 mAh labels are affixed directly over a label that says 650 mAh. Other times my camera's manufacturer drain-tested the battery to find is was FAR less than the 1000 mAh promised, at only 650 or 740 mAh.

Have you, Steveor anyone else performed or considered performinga drain test to find out what these third party batteries really are?
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Old Sep 18, 2008, 1:39 AM   #2
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The big problem with testing batteries, is first, establishing test parameters. Constant-current load testing is usually how tests are run, but this doesn't reflect the load conditions in actual use of a camera. And each model camera is going to have its own characteristic. Determining the end-point can also be a problem, as the remaining voltage level which would cause one camera to shut down, would allow another to run for quite some time. This being the case, the same battery could provide different amounts of energy to different cameras, leading to the the label confusion.

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