Petition for battery testing standards!

[brushlessboy16]

This is a petition that when completed will be sent to battery manufacturers to see if they would be willing to conform so we can get at least something close to actual, comparable data... I call it the BW Rating system.

Lipo battery capacity guidelines

- This test should start with a battery or cell discharged to 3.0 volts per cels (+/- .02v)
- Using a lipo friendly(cc/cv) charger with either a built in capacity readout or using a device such as a watt meter to monitor input into the battery.
- The final product- measured in milliamps is produced when the pack or cell have peak charged to 4.20 volts per cell.

Constant Amperage testing guidelines-
-To be performed at a predetermined temperature

-The constant amp rating is the rating at which a cell or battery can hold no less than 3.5 volts per cell under load, OR not change in external temperature by more then 40 degrees Fahrenheit during the duration of the test- Which ever comes first.

- If the temperature cutoff cuts the test short, amperage should be reduced to such a point whereas the cells do not exceed maximum testing temperature. this amperage is your constant amperage rating



Burst Amperage testing guidelines-
-Test to be performed at a Pre determined temperature

-The burst amperage rating at which a cell can sustain 3.2 volts per cell under extreme load for 10 seconds OR without seeing an external temperature increase of 30 degrees farenheit- Which ever comes first.

- In the event that a cell or battery test is cut short by maximum temperature cutoff, the amperage should be reduced to a point where the pack/cells do not exceed maximum temperature cutoff- this amperage is your burst amperage rating



All amperages then can be converted to actual C ratings using the formula
A / aH=C

If you felt that this testing method would improve the quality of the hobby please submit your vote and post your name and a "yes" or "no" in this thread

[eovnu87435ds]

I feel this would be very beneficial to the hobby, especially with all the newcomers into 1/8th scale electrics. Good luck convincing the manufacturers though. The best way to start is to find someone who has alot of lipo experience, and the equipment needed to test the lipos in this fashion, and start by testing lipos bought or donated, and create a database of the results, where everybody can see the standardized testing results. It would not be to prove that companies are lying, but to show a true comparison from one lipo to the next. the more popular this database gets, the more likely a company will be willing to adopt this rating system for their own lipos.

[snellemin]

76 degrees is silly. I want to see 100 degrees data, real world environments.

[brushlessboy16]

Originally Posted by snellemin

76 degrees is silly. I want to see 100 degrees data, real world environments.

edited.

[Arct1k]

You did not define a capacity test

ps who's the 1?

[zeropointbug]

Why not just a label that states the packs Ri, that will tell us most of what we need to know right there in one simple number, much better than a C rating obviously.

EDIT: and a simple discharge curve at various C rates, with clear defined grid zoomed in on the graph lines.

Also a C rating should be really based on temperature though, it should be a predefined average voltage under load. Because some cells are different dimensions, which would for a given temp, one pack might have a higher/lower voltage under load because of a different heat dissipation level (cooling area)

[zeropointbug]

Originally Posted by Arct1k

ps who's the 1?

Some silly silly man.

[snellemin]

It will be hard to convince most battery manufacturers to list their cont. and max specs. Not good for their competition and show what common cells they use in their packs.

[BrianG]

Obviously, I voted yes, but the actual standard needs to be hashed over. However, until someone/some company comes forward with the means and proper equipment, and they are accepted as a non-biased third party, I don't see this thread going anywhere. It's easy to say something needs to be done, but it's altogether different to actually do something about it.

[brushlessboy16]

Originally Posted by Arct1k

You did not define a capacity test

ps who's the 1?

Edited

[ClodMaxx]

Originally Posted by zeropointbug

Some silly silly man.

now there appears to be 4 of them.

[BrianG]

Originally Posted by zeropointbug

Why not just a label that states the packs Ri, that will tell us most of what we need to know right there in one simple number, much better than a C rating obviously...

Trouble with stating a single resistance number is that it is not constant. It is a curve which is a function of discharge rate and temperature. The label would have to show a graph, or at least provide the range of Ri vs temperature and discharge rate.

[Arct1k]

don;t like capacity defintion as measuring input not output..

[zeropointbug]

Originally Posted by BrianG

Trouble with stating a single resistance number is that it is not constant. It is a curve which is a function of discharge rate and temperature. The label would have to show a graph, or at least provide the range of Ri vs temperature and discharge rate.

Yah, good point, but all you would need is a temperature controlled testing, as one who would test them would most likely have. I don't really know what kind method Hyperion uses to calculate their packs Ri, but they say my 3s 4200 packs have 4mOhm, and the 720i NET reads between 4-5mOhm, and my other last gen. Hyperion VX Enerland 6s packs read 23mOhm, or 11.5mOhm per 3s.

[E-Revonut]

Honestly I would be pretty happy if they just stated at what voltages they got their C ratings! Equally important......A standard balance tap for the industry!!!!