Summary The latest and greatest! Huge capacity and endurance, with over 315 Ah of capacity and 8000 rated cycles the 315EX is the successor to both the legendary SFK-300HP and SFK-275EX batteries. Available in both EX and EX (coming soon), the 315EX battery is equipped with the GEN 2 B switch, RS-485 data port (optional), Victron Communication, and triple heating modes (low temp charging, standby heating or disabled) making it the NEW ultimate battery!