RC-Monster Forums - Lipo Battery Standards, open discussion

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As I matter of fact I can, and do. I'm glad to know that you know that multimeters need to be calibrated. Sorry for being off track, I was still on page one and didn't really bother to read the rest of the post. That is really unusual for me, sorry about that.

I just wish that NIST would get involved in determining "C" ratings. There needs to be some sort of international standard to determine what a "C" is and how its measured. Otherwise I am going to start buying 15C cells and selling them a 1.5H cells and just say that H is better than C. Until there is some sort of standard as to what a "C" really is, we need to be using accepted standards like voltage, watts, internal resistance, and mAH capacity. These can be tested by anyone with accepted standards and are quantifiable.

Sorry, I go on rants sometimes. I know that people generally don't know who/what NIST is, and what the deuce is a standard. BTW a standard is a piece of equipment that is used to measure other measuring devices. IE a really specific multimeter that is used to test other multimeters. Something like I use reads 1.002493mA when the multimeter you use reads 1.0ma. This ensures that your multimeter is accurate. And that is what I do for a living.

BTW, if I can get some standards that are accepted I would love to start doing some empirical testing on LiPo batteries.

Quote:

Originally Posted by BrianG (Post 167924)

I could make the time, but don't have the resources.

If I was to do it, I'd probably get a bunch of dummy loads and put them in combinations of parallel configs to get the approximate load needed. Then, hook the cell up to an Eagletree (or something similar) and measure voltages and temps in 10 second intervals for the continuous test, and 10-50 milli-second intervals for the burst test (to capture the 0.5s pulse readings). This is assuming the ET device can be modded to handle higher currents without insertion losses (only being used for voltage). Also, I assume the raw data can be saved? Need those for custom calculations and graphs.

That said, what reseller is going to go on the word of just some dude doing these tests in their basement? I was thinking more of an already established third party testing company.

Just an afterthought. Look into a calibration company to do the testing that you are looking for. They are certified and inspected by NIST on a regular basis, have extensive, and expensive test equipment, and tons of dummy loads, as well as be able to provide you the raw data and what their findings are.

Not a lot of people know about calibration so it is overlooked. But this may be the way to go. Like I said, just an afterthought.