This is the Series 10 Gauge Wire Harness from Castle Creations.
FEATURES: Connects two battery packs in series enabling the voltage to be
INCLUDES: Series 10 Gauge Wire Harness with two Deans male plugs and one Deans
REQUIRES: Connecting to batteries and electronic speed control
SPECS: Wire Length Between Connectors: 5" (127mm)
Wire Size: 10 gauge
COMMENTS: Use only identically prepared packs with this harness. Both packs
must be fully charged and properly balanced. Both packs must be
from the same manufacturer, have the same C rating, capacity and
level of charge at all times. Failure to observe this warning will
result in battery damage.