head mdc cr123 with 2AA host = ok
because each AA is 1.5v
2x 1.5v = 3v
head mdc cr123 with 1x 16340 or 1x 16650 or 1x 14500 or 1x 18650 = NOT ok
1x 16340 or 16650 or 14500 or 1z 18650 is 3,7v
3,7v > 3v
because each AA is 1.5v
2x 1.5v = 3v
head mdc cr123 with 1x 16340 or 1x 16650 or 1x 14500 or 1x 18650 = NOT ok
1x 16340 or 16650 or 14500 or 1z 18650 is 3,7v
3,7v > 3v