My Sinar batteries are not "Aston Martin tires" or any such thing, they're just batteries (Pisen TS-DV0001-F570 7.2V 2000mAh Li-Ion batteries) apparently out of China.
I purchased a few identical replacements from a company in Hong Kong, but they only had a few and informed me after several weeks of trying that the manufacturer wasn't making them any longer. (True or not, I can't say.)
(I spend some time in the field away from power sources for extended times so I was looking for quite a few batteries.)
Sony NP-F750 [7.2V, 15.8Wh (= 2194 mAh)] and Ray-O-Vac RAY550 [7.2V, 2100mAh] batteries work in the camera just fine but have a fit issue with the e75LV back (they're too big).
Energizer ER-C520 [7.2V, 2000mAh] have been working just fine for months.
I find the Sony BC-V500 charger is great--it charges 2 at a time, is world power compatible (req's physical adaptation), and is about as compact as possible, given the battery sizes.
Best regards,
Brad