Looking for a second EN-EL15 type battery for my gripped D810 and D600.

Bought a 'Genuine' Nikon EN-EL15a from overseas (China/Hongkong) and it was a dud. Wouldn't hold a charge, and the activity light on the charger was flashing at a crazy rate.

On checking with the Nikon website it appeared to be a genuine item so maybe it wasn't a forgery, just a bad unit. Anyway the seller, to their credit, issued an immediate refund and didn't require the faulty battery to be returned.

I've tried another offshore seller and will see how that turns out but not overly hopeful.

I've also ordered a HAHNEL EXTREME LI-ION BATTERY EL-EN15HP from DCXPERT (CRK's retail arm) @ $47.40 so fingers crossed that it is good as stated. I'll report back when said items arrive and have been tested.