skippster76
Newly Enlightened
Hi i have 2x 17670 which i run my surefire kroma mil-spec, can i use these to also run my u2 ultra, many thanks,jim.
I wouldn't be so sure.
The original U2 had a boost type circuit to drive the LuxV with its 6V+ forward voltage. That particular circuit worked OK with a single li-ion cell. The U2A, on the other hand, uses a SSC P4 which has a much lower forward voltage - around 3.5V - and would need a buck circuit when powered by 2 lithium primaries, as intended. As a result, it might underdrive the emitter when using a single li-ion cell, or the levels might get messed up, or it might not work at all... who knows.
Someone with a U2A needs to try it and report the results.
I wouldn't be so sure.
The original U2 had a boost type circuit to drive the LuxV with its 6V+ forward voltage. That particular circuit worked OK with a single li-ion cell. The U2A, on the other hand, uses a SSC P4 which has a much lower forward voltage - around 3.5V - and would need a buck circuit when powered by 2 lithium primaries, as intended. As a result, it might underdrive the emitter when using a single li-ion cell, or the levels might get messed up, or it might not work at all... who knows.
Someone with a U2A needs to try it and report the results.