The Samsung 25r is one of the longest standing trusted 18650 batteries on the market. The 25r comes at a slightly lower price so are chosen by a lot of people running multiple battery systems to keep costs down slightly. With a 50A max pulse draw capacity they are still a fantastic choice for high load applications.
1x Genuine Samsung INR 18650 - 25R High Drain Lithium Ion Battery. 2500mAh capacity - 20A Continuous Discharge
Sony VTC5A 18650 High Drain Lithium Ion Battery
Sanyo 20700B 4000mAh Lithium Ion Battery
Efest 20700 3100mAh 30A Battery
Samsung 30T 21700 35A High Drain Lithium Ion Battery