18650 Battery Box - TOOGOO(R) Rectangle In Parallel 2-Wired 4 x 3.7V 18650 Battery Holder Case Black Material: Plastic, Metal Fit for: 4 x 3.7V 18650 Battery (Not Included The Battery) Battery Connect Type: In Parallel Total Size: 79 x 78 x 21mm/3.1" x 3" x 0.87"(L*W*H) Wire Length: 11cm/4.3"; Hole Dia: 3mm/0.12"