OK folks, so I bought [2] 8xAA Battery Sleds, so I can wire them in SERIES, to DOUBLE VOLTAGE, however, I'm unsure how to wire them in SERIES to DOUBLE VOLTAGE
I just tested them w/ my voltmeter and w/ checking BOTH, I was still only getting 10.5 volts
Red>Red and black>black only showed 10.5 volts. So do I wire red>black and red>black