| Joined: | Mon Apr 2nd, 2012 |
| Location: | South Lakeland, UK |
| Posts: | 4066 |
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As far as I know the EN-EL15a is a slightly higher capacity version of the EN-EL15.
Like the newer version EN-EL4a, essentially the same as the EN-EL4 original but slightly higher capacity taking advantage of advances in battery technology.
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Robert.