Space for a standard 18650 batteries. Cable length: 15cm. Output: 3.7V Dimensions (approx.): 76 x 20 x 20mm Weight: 6g high-quality plastic material

Space for two standard 18650 batteries. Cable length: 15cm. Output: 7.2V Dimensions (approx.): 76 x 40 x 20mm Weight: 12g high-quality plastic material

9V output metal jacket body Excellent finish quality prevents leakage Easy to install and replace Corrosion-free connection points for long-term use Mercury and cadmium 0%. Environmentally Friendly