I bought three new packs from a respected matcher begining of March Intellect 4200 WCs code DADNU. These are great batterys and the Matcher is great to deal with no probs there.
The last race I ran the pack I picked to run in the main didnt seem like it took very long to charge,less than 800 sec to peak. Theres was a delay in the race schedule ( PA went down ) battery was already in the car and ready to go so I decided to repeak the battery which is something I havent done with these batts before. When my race was called to the grid the car would just barely creep forward but the lights were on on the personal trans and ESC .... I missed the race :( Thougth I had a motor or ESC problem but have found no problem there.
Today I was cycling my packs ( I,m lucky to get to race once a month lately and am looking forward to the next FOCAR race :thumbsup: ) and the numbers on my " MAIN PACK " on my GFX 35 Charging at 6.5 amps .02 cut off Discharging at 30 amps down to 4.0 volts are :

Pk Volts : 6.05
RIR : 83
AIR : 9.8
Dcg : 195 sec
Dcg Av V : 4.95
maHr : 1625

Can this pack be saved ? Should I have not repeaked it ? It was ran once in practice on raceday and set aside for the Main without discharging it, Bad move?
Any comments/info/HELP will be appreciated.

Lee :wave:

I'm new to this battery stuff too but I re-peak my packs all the time to get some heat in them.

lee something is wrong with that pack. i would check the voltage in each cell. i don't think that running the pack twice hurt the pack. these ib cells are very fragile. i would contact the matcher about it

as for the charging I a 4200 pack after being dumped down on a turbo 35 then a tray such as a trinity dpd should take about 45 min to charge @ 6.0 amps

for these ib 4200 I would follow this from TQ Cells only thing is if your not going to run the pack for a few weeks or a month I would put more charge in them.

"Race Day" recommended procedure

Here's step by step, the recommended charge/discharge procedure that you should follow while at the race track.

If you're going to run the battery pack only once on race day

Just before charging the battery pack, using a tray such as the Integy 0-30 or Trinity DPD individually discharge each cells (0-30: Until the lights go dim) (DPD: Set at 1.0V per cell ... 5A linear or 30A pulse)
Then, charge at 6A - 5mV per cell cutoff. (4-cell=0.02 ... 6-cell=0.03)
Re-Peak just before going out on the track at 6A - 2mV per cell cutoff. (0.01)
After your run on the track, and as soon as you're back to your pit ... (pack is still warm) discharge the battery pack at 35A down to 1V per cell ... 4-cell=4.00V ... 6-cell=6.00V.
Once the battery pack has completely cooled down (can be next day), using a tray such as the Integy 0-30 or Trinity DPD individually discharge each cells (0-30: Until the lights go dim) (DPD: Set at 1.0V per cell ... 5A linear or 30A pulse)
Then, put 1500mAh back in the battery pack (900 seconds of charge @ 6A).
Let the battery pack rest in that state.
Monitor cells' voltage now and then, and if need be, put more charge in the battery pack so the cells' voltage stay above 1.1V.
If you're going to run the battery pack for a second time on race day

Just before charging the battery pack for the first run, using a tray such as the Integy 0-30 or Trinity DPD individually discharge each cells (0-30: Until the lights go dim) (DPD: Set at 1.0V per cell ... 5A linear or 30A pulse)
Then, charge at 6A - 5mV per cell cutoff. (4-cell=0.02 ... 6-cell=0.03)
Re-Peak just before going out on the track at 6A - 2mV per cell cutoff. (0.01)
After your run on the track, and as soon as you're back to your pit ... (pack is still warm) discharge the battery pack at 35A down to 1V per cell ... 4-cell=4.00V ... 6-cell=6.00V.
Let the battery pack completely cool down to room temperature (will require at least 90 minutes)
Then, just before re-charging the battery pack for the second run, using again a tray such as the Integy 0-30 or Trinity DPD individually discharge each cells (0-30: Until the lights go dim) (DPD: Set at 1.0V per cell ... 5A linear or 30A pulse)
Then, charge at 6A - 5mV per cell cutoff. (4-cell=0.02 ... 6-cell=0.03)
Re-Peak just before going out on the track at 6A - 2mV per cell cutoff. (0.01)
After your run on the track, and as soon as you're back to your pit ... (pack is still warm) discharge the battery pack at 35A down to 1V per cell ... 4-cell=4.00V ... 6-cell=6.00V.
Once the battery pack has completely cooled down (can be next day), using a tray such as the Integy 0-30 or Trinity DPD individually discharge each cells (0-30: Until the lights go dim) (DPD: Set at 1.0V per cell ... 5A linear or 30A pulse)
Then, put 1500mAh back in the battery pack (900 seconds of charge @ 6A).
Let the battery pack rest in that state.
Monitor cells' voltage now and then, and if need be, put more charge in the battery pack so the cells' voltage stay above 1.1V.

Thanks Dave

I sure do miss the old GP 3300s :rolleyes: guess I need to put my Tekin Batt Doc, 2 Trinity AbsouluteZeros & antique Integy Indi Octane on swap & sale LOL.

The indivdual cell volts are all above 1.28 volts, I,m going to cycle it again later this afternoon, see what happens.