bobgreen wrote:
My Nikon d7100 uses an EN-EL15 lithium battery. I'd like to purchase a backup battery plus a charger . I've seen a wide range of prices from a variety of sources- $90 to $20. I know it isn't much money but I don't like wasting it either. Is one as good as another or is the Nikon that much better?
I would be VERY careful about third party chargers. Lithium batteries have specific max charge rates and must never be overcharged. Violate either of these and you could have a lithium fire. Since the charger controls both of these aspects I would not go cheap on a charger. For those reasons I would stay with the oem units. Third party cells may be ok. Check their mAH ratings. Equal or greater than oem might last longer.