Have 4 - 12S sticks 2600mah 30C continuous with EC5 connectors and kept on storage charge when not in use.
About 2 years old with roughly 50 flights per stick never crashed.
One has minor damage to the shrink in the center of the pack and has a small amount of packing tape on it.
They're in GC and still put out plenty of power.
Getting 5 minute flights on an E5 running Rail556 mains on a 12T pinion using an Ice2 HV80/Align RCM-BL700MX 510kv motor.
$180 shipped conus for all 4
or $45 each shipped.