jclaice Posted August 24, 2008 Share Posted August 24, 2008 What happens when I push the calibrate button on my MH-22 Nikon battery charger, and this may be rhetoric but why does it take over 8 hours to complete the calibration cycle? Link to comment Share on other sites More sharing options...
rnt Posted August 24, 2008 Share Posted August 24, 2008 Probably because it completely discharges the battery at a specific drain current and then completely recharges it. For thermal reasons you can't discharge or charge the battery too fast, so it can take some time... Link to comment Share on other sites More sharing options...
Spearhead Posted August 24, 2008 Share Posted August 24, 2008 One thing to speed it up is calibrating when the battery is close to empty. The discharge cycle will be much shorter. Music and Portraits Blog: Life in Portugal Link to comment Share on other sites More sharing options...
tim_knight Posted August 24, 2008 Share Posted August 24, 2008 Jeff, At work we use radios to communicate with all of the manufacturing operators and our forktrucks are battery powered. In both cases the instructions are the same, completely charge the battery first before starting the discharge cycle. Yes we have to allow more downtime for the batteries scheduled for this maintenance, but it pays off. Our supplier keeps telling us how much longer our batteries last compared to other companies. Link to comment Share on other sites More sharing options...
Spearhead Posted August 24, 2008 Share Posted August 24, 2008 I will have to remember that the next time I use a camera battery in a forklift. For now, however, it's worth pointing out that the purpose of the calibration in both Nikon and Canon chargers is to find the discharge point and full point in order to provide an accurate display of battery time remaining. It has nothing to do with the life of the battery. Music and Portraits Blog: Life in Portugal Link to comment Share on other sites More sharing options...
jclaice Posted August 24, 2008 Author Share Posted August 24, 2008 Thanks all for the explanation. I had suspected this may be the case discharge and recharge, I needed confirmation. Thanks again. Joe Link to comment Share on other sites More sharing options...
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