I don't know what the argument is here. I essentially did a load test on the battery
, per the "BB.C" method, as outlined by R.F., although I may not have left the headlamp on for a full two minutes. I have performed the same test in the past on a weak battery
, and, when loaded, the voltage dropped into the elevens, and then when unloaded, only recovered into the low twelves. A duff battery
will perform even worse.
We have a load tester at work that we use to test our 80-110 AH marine deep-cycle batteries
, and I agree that the load is a bit heavy for anything smaller than a 30 AH battery
. That is, you want to hold the button for a shorter period of time, and it may show "slightly weak" for a good battery
I failed to mention that, immediately after charging (i.e., with a charger), battery
voltage will read inordinately high, like 13V - you have to let the battery
sit for a while to get an accurate static voltage reading.