I recently purchased two new Nikon EN-EL14a batteries, one from Adorama and the other from B&H. The one from Adorama charged to 68% after being on the charger for about 36 hours. The one from B&H will not hold a charge at all (Once in D3s battery indicator blinks and menu will not display probably due to low battery.) after being on the charger for almost 48 hours with green percentage lights only showing 50%. Do I have two bad batteries or should I look at replacing the MK-MH21 charger? My third battery which came with the D3s is fine and will charge to 100%. Any help is appreciated.
I'm going to assume the answer to Brian's question is that you mean the EN-EL4a batteries. But then I ask, do you mean the Nikon MH-21 charger? Because the only "MK-MH21" chargers I've found are third-party units.
If they are Nikon batteries, I'd try them in a Nikon charger before declaring them defective.
Thank you gentlemen for responding so quickly. I will order the correct charger today. I purchased the D3s used and a generic charger was included. I've got a Nikon MH-21 charger on the way. Thanks again - you guys are why I love Nikonians.org.
The Nikon charger has a refresh cycle. I suggest using it before retuning those batteries, unless they are generic in which case you got what you paid for. Not that all generic batteries are bad, but many are not worth the risk.
I have used, and still use, 3rd party batteries and chargers along with my OEM Nikon batteries/chargers. I have only had one bad experience, and it was with a non OEM EN-EL4a charger that was supposed to charge both EN-EL4a & EN-EL3e batteries. I sent it back twice, then finally gave up on it ever working correctly. It would only give me about an 80% charge on both kinds of batteries. I've never had a problem with any of the other chargers/batteries.