To be absolutely frank, I don't know if the LG cells are good, bad, genuine or fake. What I do know is your "scientific tests" are performed poorly, and not strong evidence. If you are going to try to destroy someone's livelihood, you want to be pretty damn sure what you're saying is true.
The VRUZEND cells were close to $40 with tax. Maybe more with shipping and the cells close to $100 for 24. The packs I built cost at least $230 to build and were not designed for any hills then for a 250 pound person on an electric bike. Possibly double the cost or about $450 minimum in battery just to climb a little hill.
I thought it over and looked on you-tube and did NOT see the test that I am looking for concerning 18650 cells. Like I stated earlier the capacity of the cells is really not that important as long as it is > or = to 2,000. Discharge rate however means everything. How hot a 18650 cell gets during it's rated normal discharge is the most important variable. That variable will determine whether any 18650 cell is worth running in a real world application.
I know you no longer blame Vruzend, which is good, but you could be ruining the reputation of an eBay business, which is trying to make a modest living out of thin margins, and rely on a good rep to do so.
I guess. However they could have said that a single kit like the one I bought is only suitable to replace a battery pack on a kids toy razor scooter with a 280 watt motor that comes standard in millions of toys. Obviously NOT suitable for a large adult on an electric bicycle.
It should have said in large bold lettering on the box what current each cap was rated for.
Back to testing. I am looking for a small thermometer which either attaches to the outside of an 18650 cell or wraps around a cell. That hooked to a digital display and put under the same real world discharge current which the cell is rated for would determine the SAFE ZONE that the cell can be discharged.
Product safety. Not rocket science and whatever 3 letter agency which covers product and consumer safety should govern such tests to make sure vendors who sell these products are NOT misleading the consumers to use these batteries in an unsafe manor by exceeding the discharge rate of a cell causing thermal runaway and possible fire.
It should not be that difficult to conduct such a test. Obviously it would be more important from a safety standard than capacity. However I do NOT see that such a test exists.
tomjasz claims to have sold hundreds or thousands of cells. I would like to have just one of those cells to test against one of mine and that would determine which LG cells are the genuine real deal.
I have read much on these types of cells and they are becoming popular for many e bike builders so my new testing methods could save a lot of builders time and heartache and possibly lives. Any further feedback on how I could start testing for discharge vs heat output would be greatly appreciated.
What I suspected was then in fact true and the VRUZEND kit was a waste of money as I am not a kid and do not own a razor scooter so the current limitations that you have made me aware of means that I need to go thru with my plan to throw every last piece into the trash and use the 1/4" magnets to attach a wire terminal and use a modest amount of high temperature JB weld to secure the magnet and terminal to each cell top and bottom when rebuilding the pack.
Moving on, I have some time before my BMSs arrive so would like any information possible how I could set up some tests current vs heat output. I need some way of measuring the cell temperature in degrees under load so I can at least compare the LG cells to the Wall-Mart Westinghouse cells and used laptop cells I currently have.
Then I can look around for different vendors and try to order single LG cells and other name brands to test and post the results right here on ES and on you-tube. That could help a lot of people. I can also do standard capacity tests while doing the videos. Thanks again and please get back to me on any possible test equipment which will measure the temperature from the outside of each cell case accurately. Thanks for your patience.
PS. I will go back and edit/erase my statements. Especially the one that Wtuber did not like. Hopefully then he can forgive me and stay on the post.
Exactly what I was looking for. However scared to price a thermal camera.
Still looking for a thermometer.
https://www.ebay.com/itm/HT-175-Imaging ... 3523781991
DA. Do you think this is an accurate tool and would work for what I want to do ? Please let me know.
Plasic caps 3D printed. Must be an old post. magnets yes. Epoxy Probably not. plastic ? HELL NO
I build e bikes. There not always pretty or practical but sometimes they work, at least for awhile. Immortality is not a dream but the future of our evolution. We were given the tools to forge our own destiny. We were created in gods image and shall evolve to live forever.