x20 team Battery Recover

Recover a drain x20 battery (the charger wont give charge if the voltage is too low and start blinking the two leds )
by boost it with a parallel connection with a full charge battery for a while the voltage on the low voltage battery recover fast.
sometimes i do this manually just with wires but is not practical and there's a risk of short circuit.

PROCEDURE:
connect the a full and the drain battery's , keep the parallel connection for 30seconds to one minute max.
remove the drain battery
wait a few minutes to battery cool down
put to charge again
and the charger accepts the battery now

need :
four long faston 6.3 male terminals or similar
piece of wire
connect + with + and - with - ( PARALLEL)
hot glue to secure it inside
glue the lid