EN-EL4a lifetime question

Started Jan 26, 2014 | Discussions thread
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jfriend00 Forum Pro • Posts: 11,307
EN-EL4a lifetime question

I have several EN-EL4a batteries that I use in both a D2x and a D300/D700 with grip.  Recently one of the batteries just died on me completely.  I'd pull it out of the charger and it wouldn't work at all.  Then, I discovered that the batteries have a "Charging Life" and the camera will show you where a given battery stands with a rating of 0-4 where 0 is new and 4 is old.

What is known about this charging life?  Is this a given number of charging cycles?  Or related to total power used?  Are these advisory only or does the battery just shut-down proactively and refused to be used any further when it hits 4?

I own 3 EN-EL4a batteries now.  Two have a charging life rating of 3 and one says 4.  I'm wondering what these numbers mean for the future lifetime of these batteries?

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