2×18650 7.4v Battery Holder With On/off Switch coupling 6mm 54mm right angle connector :

54mm right angle connector :

The measurement allowed error is +/- 1-3cm

in particular

2V / bad battery recognition and activation

175/4/5/6/6

2×18650 7.4v Battery Holder With On/off Switch coupling 6mm 54mm right angle connector :218650 7. 4V Battery Holder with ON OFF Switch Features: 1. Model: DK BW3X2 2. Name: Battery Holder 3. This battery box holder with pin connector, fit for 18650 batteries. 4. With weld leg design, you can easily to put the battery in it. 5. With a cap and on off switch button Specifications: 1. Design: Serial Connection 2. Fit for: 218650 3. 7VBattery (Not Included) 3. Rated voltage: DC 7. 4V 4. Dimension: 8. 8 x 4. 1 x 2. 2cm (L*W*H) 5. Wire Length: