What was found
DURING DEPARTURE, CLIMBING THRU 4200FT THE "BAT LOW" LEVEL 1 LIGHT DISPLAYED, 1 VOLT BOXED IN AMBER SHOWED ON ELEC SYS DISPLAY. DISPLAY SHOWED "LAND AT NEAREST SUITABLE AIRPORT". PROCEDURES FOLLOWED, FUEL DUMPED (APPROX 65K KILO'S). AIRCRAFT RETURNED TO AIRFIELD, NORMAL LANDING. MX FOUND LOOSE CONNECTOR AT BATTERY. RE-SECURED CONNECTOR IAW 24-34-02. TESTED & INSPECTED WITH NO DEFECTS NOTED. A/C RETURNED TO SERVICE.