If both batteries are from the same batch, I'd suspect them. The battery batch should be on the battery. If they are the same, consider buying a battery from your local camera store to ensure the new battery is from a different batch. Alternately, you can email B&H and tell them you'd like to buy a battery with a different batch I'd.
Less likely though possible is a defective battery charger. The likelihood increases if the batteries are from different batches. Consider cleaning the contacts in the charger. Though I think this is a real long shot, it is cheap to try.
Nevertheless were it me, I'd definitely buy another battery.