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"RE: D5100 Battery"
If you are super worry you can do these steps, should do with Nikon pack too then:- Measure the terminal voltage on your original pack.- Measure the terminal voltage on the new pack. - Charge the new pack and measure the voltage again.The voltage in all cases should be in range of 3–4.2 V per cell. Which is 6 to 8.4V in case of 2 cell EL14.http://en.wikipedia.org/wiki/Lithium-ion_batteryFully charged pack will be close to 8.4V or slightly under.