My camera with the eneloops is on its way, i’m going to fully charge them and test it out, see what i get
Can I test for voltage sag under load?
Two others who have tested this light with eneloops got 1.9 amps, does this mean the AMCs are splitting it equally, or does it mean only some of them are operating?
I am curious because if we assume both of their lights work correctly and this is the capability of the eneloops, if I get 1.6 or 1.8 amps with them would it suggest an AMC failure, or would it still be 1.9 if one or two failed since that would be less then the difference between 1.9 and 2.8 that the driver should be pulling?
I agree, i am looking into lithium with plans to order soon, do you have any sanyo 18650s? Can they or any average 18650 put out 2.8amps or does it have to be 26650 for full amperage?
Also i tested the eneloops late last night, it gave 2.02 amps peak
A good 18650 should give you everything the light has. The 18650 and 26650 are both 3.7 volt batteries so, you should see about the same current draw, just a little less run time with the smaller battery.
1. You can. You need to disassemble the light, connect the cells with magnets and add some leads. Now install the leads of the DMM to read the voltage of all 4 cells in series -> should give you about 6V. If you now connect this setup to the pill, it will light up and the voltage will sag to somewhere around 3.5V.
2. They dont work at all, the light basically goes direct drive.
3. The driver doesnt pull anything, the LED does. The driver just regulates it, because XMLs can pull 5A or more from good cells. By building a driver in, you limit it to 2.8A (in this case).
Now LEDs do have a forward voltage. They wont light up below a certain voltage and this voltage determines current draw. The higher the voltage, the higher the current draw. But its very inaccurate, thats why AMC-baseds drivers are so popular. They regulate the current and let the forward voltage determinate itself.
~no scientific explanation, but thats how I understood it and it works out in real-life applications~
So, would it be correct to say that the amperage for eneloop batteries is sagging under the current draw to the led lower limit and thats what setting the 1.9 to 2amp draw limit?
Since the light uses 3 batteries in series, would using 4 batteries allow more current to flow, less sagging on each?
Would trying this damage the led or driver since it has a 4.5volt limit?
I'd grab a tr01 for under 10$ and rip apart that lap top battery pack .unless you have a real dud then there are going to be probably 5 decent cells in it . meanwhile i'd order a few decent batteries and wait on those .
I assume there are only a few bad cells screwing up the entire pack that's normally the case ..buy a tr01 from T mart or someone who will ship it fast and then you can wait on the rest .
I re-read my posts, i did write it a bit confusingly, the laptop batteries are maybe 5 years old and at 100% charge (4.2V) only hold 40% of what they did when new.
I am planning to buy some new 18650 or 26650 batteries with a decent charger, but i have not decided what is the best value, i don’t mind spending a bit more, but i have to careful about cost. I am currently considering the sanyo 18650 from intl outdoor, unless someone has better suggestions.
How ironic you replied to this old thread just now, the cells i ordered arrived today, and like i posted in the what you got today thread, still no dice, 2.44 on high, 0.75 medium, 0.11 low
Try changing the driver and see if that brings any change. Or you can take the driver out and test it separately out of the pill but still connected to an XM-L.
