USED WITH THE D300/D700 GRIP (MB-D10 )
The BL-3 is the battery chamber cover that is required for when the Nikon EN-EL4 or EN-EL4A battery is used with the optional MB-D10 Multi-Power battery grip. It clips onto the battery, and replaces the standard tray that comes supplied with the battery pack.
Using that battery increases the FPS rate of the camera.
I sold my D300, so I have no use for this anymore.
$30. I accept PayPal or Cash in hand if meeting locally in the Coppell area
Compare at $46.99.
Thanks!