Can vouch for the Sony VTC5As, very good batteries, they might not have the 3000mAh capacity but in my experience they actually last longer because they don't drop in voltage as much during use, so they seem to run down further before the low voltage cut-off kicks in. Superb in mechs too. Edit: oh and for batteries, nkon.nl were excellent, prices are miles better than elsewhere, easily offsetting the postage cost, and they have a huge selection.
Also for anyone in the market for a new RTA for the 10-60W range I can highly recommend the Coppervape clone of the Skyline RTA, picked mine up from 3fvape. The "airdisks" they call them (airflow inserts) mean you can dial in the airflow to exactly what you want much better than you can with the ring. I'd advise picking up the additional set of airdisks for $5 or whatever. Currently running mine with the 2x1.5mm holes insert, with a 3mm ID, 0.5mm wrapped in 0.2mm kanthal 5.5 wrap clapton, at 28W. Most flavourful tank I've used, it's basically a more refined Kayfun 5. The juice flow control is better (will handle any VG, better adjustment and visibility), the airflow is extremely smooth, and the general construction is better.