So i'm planning a battery build, a 14s6p pack, and so ordered 84 HG2s which arrived yesterday. I took a bit of gamble and ordered them from dhgate.
I made the mistake of researching fake cells after ordering them and found out that HG2s are pretty much the most faked cell out there. Woops! The cells look new and appear of reasonable physical quality from the exterior but they do have a tell tale sign of not being the real deal in that the ring insulator is very shiny plastic, where the originals apparently have a matte/textured one. It's not definite though. I haven't removed any wrapps yet but I may do to check the can itself.
I tested the voltage quickly on about 20 of them and they were all within .01V of eachother. I have an Opus BT-C3100 arriving soon which is capable of a discharge capacity test so it will be interesting to run a few through that.
If they have a reasonable capacity then I will probably still use them. My controller is 45A so each cell should only see about 7.5A. I was hoping for a lot of headroom in terms of power so the cells had an easier life but as it turns out, a lot of the fake HG2s are more comfortable at 10A.
What would be the easiest way to test a cell at 10A?
I could hook up a voltmeter and temp probe to a cell and put a 0.37 ohm load on it? In the absence of a data logger, I could monitor closely and record the temp and volts each minute until it reaches 2.5v? Would take less than 20mins I think, (18 would be good :wink
I could do it first on a light load, maybe 1 ohm.
I just want to be sure they are reasonably happy at 10A so I can have some faith in them performing ok in a pack.
Is there another way short of spending $$$?
Am I overthinking it?
I made the mistake of researching fake cells after ordering them and found out that HG2s are pretty much the most faked cell out there. Woops! The cells look new and appear of reasonable physical quality from the exterior but they do have a tell tale sign of not being the real deal in that the ring insulator is very shiny plastic, where the originals apparently have a matte/textured one. It's not definite though. I haven't removed any wrapps yet but I may do to check the can itself.
I tested the voltage quickly on about 20 of them and they were all within .01V of eachother. I have an Opus BT-C3100 arriving soon which is capable of a discharge capacity test so it will be interesting to run a few through that.
If they have a reasonable capacity then I will probably still use them. My controller is 45A so each cell should only see about 7.5A. I was hoping for a lot of headroom in terms of power so the cells had an easier life but as it turns out, a lot of the fake HG2s are more comfortable at 10A.
What would be the easiest way to test a cell at 10A?
I could hook up a voltmeter and temp probe to a cell and put a 0.37 ohm load on it? In the absence of a data logger, I could monitor closely and record the temp and volts each minute until it reaches 2.5v? Would take less than 20mins I think, (18 would be good :wink
I could do it first on a light load, maybe 1 ohm.
I just want to be sure they are reasonably happy at 10A so I can have some faith in them performing ok in a pack.
Is there another way short of spending $$$?
Am I overthinking it?