SMC 28C 4000/5000 Hardcase Lipo part 2
02-16-2008, 10:51 PM
#61
I wonder how heat not generated through the charging/discharging process will effect the performance of the cells? The 140F you are seeing is due to the discharge/charge cycle, correct? So if you used an external heat source to bring them to a controlled temp, and then measure any difference in performance, mabye the very high discharge/charge rates wouldn't be necessary.
02-16-2008, 10:52 PM
#62
To discharge a Lipo you need a discharger that can be set at a 3 volt cutoff per cell so for a 7.4v pack you stop discharghing at 6 volts. I believe one of the keys to make the packs perform better is to get them warm/hot. So far by using a 35 amp discharge on a fully charged pack I'm seeing good results. The temperature is 140 degrees. I'm going to purchase equipment that will allow me to discharge up to 100 amps to see if helps the pack some more.
If your serious about racing and plan on racing for awhile I would reccomend you by a Competition Electronics Lipo T35GFX. This is a great charger/discharger.
If your serious about racing and plan on racing for awhile I would reccomend you by a Competition Electronics Lipo T35GFX. This is a great charger/discharger.
02-16-2008, 11:00 PM
#63
I wonder how heat not generated through the charging/discharging process will effect the performance of the cells? The 140F you are seeing is due to the discharge/charge cycle, correct? So if you used an external heat source to bring them to a controlled temp, and then measure any difference in performance, mabye the very high discharge/charge rates wouldn't be necessary.
I'm trying to figure it out but it's pretty tough to test. As soon as I do have info I will post it.
I know that using a 12 amp charge rate over a 5 amp charge seems to yield better results. This is without warming the pack up.
When doing back to back cycles I see the best improvement which I believe is related to the heat build up from the discharge. I will be trying to heat up the packs prior to charging them to see if the results are the same.
Last edited by Danny/SMC; 02-19-2008 at 11:14 AM.
02-16-2008, 11:02 PM
#64
You don't need 3 GFXs. You only need one. Just set it to charge your packs at 12 amps which is pretty fast and you discharge them at 35 amps. One GFX can easily do this.
Last edited by Danny/SMC; 02-19-2008 at 11:12 AM.
JK. Can't wait to get the new stuff. Thanks.
02-17-2008, 08:43 PM
#71
Only 3c? ca-mon, step up to the plate. everyone in the know is charging at 10-12c minimum.
02-18-2008, 06:16 AM
#75
Hey Danny, can any discharge device be used to discharge at 35amps with 6v cutoff? Or only the GFX lipo version? I ask this because a friend tried to discharge one of the Orion lipos a few months back. I think it was either 30-35amps on a GFX. But the leads got hot very quickly! So he cut it off real quick. Just curious.