Is this battery OK?

[markj]

I want a backup battery EN-EL15 for my D7000. Most are running about $59 for the Nikon product. Would you have
any reservations of buying a www.ebay.com/itm/300644070420?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649.
These are going for $42.50 delivered. Anyone own one?

 

[Big Mike]

I have been using off-brand batteries for years. No problems so far.

 

[KmH]

IIRC Mike uses Canon gear.

Nikon batteries have some electronics on them that let the camera know how much battery life (not charge) remains. Many 3rd party batteries don't get the battery electronics to camera communication protocol right and the batteries don't work right.