Third Party EN-EL3e Battery - Pearstone
Though I tend to agree with the idea to use original NIKON battery; I did purchase a PEARSTONE for about $21. as a backup from B&H Photo. New Nikon is $44.
The battery works fine with my D300s. I tested by doing (2) 10 min and (1) 15 min video clip. The battery drained to 45%, but recovered to 62% after about 10 min. after the camera was turned off. In general, it dropped 15% after each video, but then recovered some.
The Nikon battery seems to provide better consistent energy, dropping 9% after a 10 min video, then remained at that level.
As you might know, Live View or Video is the biggest drain on the battery.
One other difference; Using BAT INFO in the Nikon menu, the number of photos taken with the battery is recorded. The Pearstone does not retain this data.
#2. "Third Party EN-EL3e Battery - LENMAR" | In response to Reply # 0phwayne3966 Registered since 08th Aug 2012Tue 28-Aug-12 08:30 PM
I purchased a third party battery manufactured by LENMAR for about $20. via on-line with Best Buy.
Battery works fine in the D90 and D300s. Tested by running a 15 minute video on fully charged battery. Battery lost 8% of the charge, then recovered to 99% after 20 minutes of no use. I used the in camera battery meter for measuring.
Unlike the Pearstone, it will remember the number of shutter clicks between removal for charges.