rayhuang

iTrader: (5)

I believe that is Trinity's 3800 cell. The first were blue-and the second black. I know they were close to receiving them last week.

letitroll

iTrader: (4)

Ok, I guess you would know...


A friend of mine told me that the next shipment of IB 3800's will be in a black shrink wrap and won't fall off after 5-6 runs like the older IB's...


Here is another question...


I've never run the IB Cell so I really don't know much about them. Do they actually fall off after about 5-6 runs?

EddieO

iTrader: (6)

I bring them down to 5.4 for on my GFX....then I put them on a Dyna-Pulse.....then I tray the suckers, then I let them rest before charging again....


Our IB3800 cells are matched 35 amps, .90 cutoff, 6 amp charge, 5000 runout...

Our IB3800 batteries are matched by SMC....

35 amp runtime numbers are easy to convert to 30 amps....just go runtimex35=x then x/30....a 420 pack will be about 490 at 30 amps.

Voltage, there is no formula....but on average its about .015 per pack....so a 1.185 would be a 1.20 at 30 amps....(REMEMBER ON AVERAGE!)

Our GP3700 cells are matched at 30 amps, .95 cutoff 5 amp charge, 5000 runout.....

We have found these settings work good for the cell, so thats what we use.....

Our GP3700 packs are matched by Fusion Batteries.

Later EddieO

racer-oZ

iTrader: (2)

eddieo, thanks for the help!

Danny/SMC

iTrader: (2)

There is no new IB3800. IB has been tweaking the 3800 since it came out to try to make it the best RC race cell. The latest batches have been real good voltage wise.

As far as the packs falling off after a few runss we haven't really heard of this. There are many who participate on this site who have been running IB3800 i'm sure they can let us know if there packs are holding up more than 5 runs.

racer-oZ

iTrader: (2)

danny, was looking at getting a pitbull x3, any concerns that it only charges up to 7amps? i've heard most guys are charging at 8amps at large events where they want the most performance out of the run. what is your charge/discharge and storage process for the 3800's. thanks for your help!

racer-oZ

Danny/SMC

iTrader: (2)

We reccomend 6 amps with .02 peak detect for the entire pack.

Discharge the pack down at 30/35 amps after your run down to .90v per cell then leave them alone until the next time you use them. Before you go to charge them you should put them on a discharge tray such as the Integy 0-30 for 1-2 minutes and then start charging them.

For long term storage 3 weeks or more put 500 seconds of charge back into the pack.

Hope this helps.

racer-oZ

iTrader: (2)

danny, thanks it does help, appreciate you guys posting all the tech advice on these threads!

dodgeguy

iTrader: (208)

Danny, What do you think of using a 030 tray after the run. I think that takes them all the way down. Then charging in say 300 seconds at 6 amps?

Danny/SMC

iTrader: (2)

I wouldn't dicharge them past .90 per cell after a run this will remove runtime.

By traying for 1 minute before charging is equalizes the cells and doesn't hurt runtime.

beidle99

iTrader: (9)

I just built up a new set of SMC 3800's and all I can say is WOW. After building up the pack and traying them down to .90 a cell and charging them at the 6 amps my Tekin charger rated the pack at 4140 Mah with a peak of 9.2+ volts, these are insane cells. Thank you Danny, I will be buying more!

mike ivy

iTrader: (51)

Ray huang you have pm I have a question for ya

koabich

Actually, the peak volts sounds kinda high. All my SMC IB 3800's peak at 8.95-9.05 and that's after 10-15 cycles. Check your peak detect and/or the solder joints.

Danny may have some more advice and maybe my packs have numbers way below the norm but the higher the peak voltage of the pack the greater the internal resistance of that pack is and/or signifies poor condition of the cells.

I would have said anything but my GP 3300's practice packs do not peak out that high.

Danny/SMC

iTrader: (2)

Actually Peak Voltage is different on different chargers. Plus room temp and airflow will have an influence on it as well. As long as the PV is low on your Tekin compared to other packs then all is fine.

koabich

Good point, I would have never thought about that or taken it into consideration.

Danny, thanks for all your input. I am sure I speak for everyone when I say it is great having someone of your standing in the industry take time out of your busy day to help us all and discuss these topics with us!