Thank you, the results are quite baffling, the discharge starts at 3.6V which is quite low for Panasonic cell. Are you shure that connection leads of your tester are thick enough? The protection board may have high internal resistance. What datecode is printed on your batteries? (it's four-character code like 18DA)
N.Shock wrote that protection board has short circuit protection which trips at 5A. I think PCB works, but in not the most efficient way.
By the way, the cells dissapeared from focalprice and reappeared at ~5% higher price :)
OK, please forgive my ignorance. But Why, if these batteries can go down to 2.3v and are able to discharge at really high currents, do we need a protection circuit? Surely in most lights it is fairly redundant? Or am I missing something?
I can understand most cells need to stay above 3v, which may be a problem in a light that takes 2 cells. As it could go down to 5v before the light turns off. Thus causing problems for the cells. But if these can go this low without damage, is a PCB needed?
Depends on test method as you saw from my results the unprotected measure ~36mOhm with an AC impedance tester. Japanese companies use these testers on the production line.
