Warning: To use this adapter properly, we recommend using a fuse thats rated about 30% higher than the max current you expect to draw. We also recommend adding a low voltage disconnect circuit or a timer to prevent the battery from dropping past low voltage threshold (which will damage the battery or shorten its life span). Typical low voltage threshold equals (Max battery voltage/4.2)*3.3 . To protect your device you should convert your voltage using a converter to match your device's acceptable voltage range.