I have BT-C3100 and Lii500 to test actual mAh on batteries. Thats fine.
But with all the new batteries that comes with lots of A (high drain), how can I actually test that?
Can I use a Voltmeter (multimeter?) or can I use my iMAX B6 80W when it comes? Or is there a good way to test if the batteries gives the Amper they promise? I have got batteries that have 10 - 60A today, so it had been nice to actually test them to see if they have so much A on them.
You need high drain equipment. Read http://lygte-info.dk/info/Batteries2012Info%20UK.html and use http://lygte-info.dk/review/batteries2012/Common18650comparator.php instead
Expensive stuff I think. And thats the only way?
Disclaimer: I don’t know anything. 
I would think that for a quick-and-dirty test, you could line up a bunch of low Vf LED’s in parallel, and use one of the many tricks that have been mentioned on here for measuring large amps (like an external shunt resistor for your meter, or using two meters together). The reason for the multiple, low Vf emitters is so that you can actually get out the max amps from your cell(s) without hitting a bottleneck at the emitter itself. This is in no way the professional way to do it, but I think for a Go/No-Go look at the max-out of your cell, it is good enough.
Using just a string of emitters and a budget meter set to measure current (max 10A) and using 12ga leads, I measured 1.5A coming out of a 10180 cell I had bought for my Hobi. In case you don’t know, a 10180 cell is the diameter of AAA and 2/5 the length. That is tiny! The cell had a capacity rating of 90mAh, but no max amps rating. I figured it might reach 500mA or so. I was certainly surprised to see it perform so well! :bigsmile: For comparison, using the same technique, a group of 4XAAA Eneloops in a stock carrier gave about the same 1.5A draw.
You can test it with a hobbycharger like the imax…but often people have just the basic versions which only can discharge 1 or 2 amps…
The 80W version can discharge with 5A if I am remembering right so test this.
No and yes. If you want to be accurate then yes expensive stuff, if you don't need very accurate then so high Amps hobby charger along with some constant load (hight watage resistor) can do it. Still you have to look on the discharge Amps and Watage hobby charger can work with. Again it is not very cheap.
@Werner. No iMAX B6 80W is the charging power. It can discharge only at 10W or <=2A (depends on voltage). The OP would need the hobby charger declared to 30A discharge and big (external) watage. More than 30A could be very demanding and costly, I think.
You are right, I was confused because I have looked at some of the high power things which can 5A in the last days…and sort the 80W version was one I had seen.
If my old trusty hobbycharger wouldn’t work so well I would buy such a beauty:
Holy moly, I never expected high-end drain equipment to command such a dollar value!
I’m familiar with utilizing voltmeters in regards to the restoration of battery life, but am quite floored at the price of the quality testing materials.
David EF's idea sounds good to me. For measuring the current you can use a clamp meter (there is/was a group buy on a decent one) or an external shunt like member dchomak shows how to build in a thread.