Sony: VTC3, VTC4, VTC5
Samsung 25r
LG: HE2, HG2
At 50W in a regulated mod just about any battery will work as long as its a safe chemistry battery. There is a guy here named "Mooch". Check out his blogs. Look for a battery he rates at 20 amps CDR and choose any one you like. The mAh rating is how long the battery will run between charges, so the higher the number the better, as long as it has a true 20A CDR rating. If you you plan to vape above 75 - 80W, you should look into the 30A CDR batteries.