Team Much-More cell master v1
12-03-2006, 12:20 AM
#1366
Originally Posted by SlamMan
I'm kinda bummed here. I just picked up 2 Mark Rheinard Cellmasters. When I hooked them up the display on one of them went haywire. A quick disconnect and reconnect and the display seems fine but then I charge the first battery on each and the status LED on the same one flickered periodically and eventually went out. What to do?
12-04-2006, 06:06 PM
#1367
Tech Regular
iTrader: (14)
I am hoping someone here can help me....
I just bought 2 new packs (4 cell), IB4200 WC's.
I used my CellMaster to charge my packs with the delta settings mentioned in this thread, without any luck. I also use the MM heat sink
The only way I can get close to a full 4200 mAh's is if I turn up the delta peak.
Here is my most recent charge info.
Amps - 6.0amp
Delta - 50
Fan start at 50c
Pack Temp cut off at 49c
These settings resulted with a charge of 4401mAh's which stopped due to DeltaPeak. The temp at cut off was 35.4c and climbed to 37.4c
Can some one let me know why I have to have the delta peak so high? Is this normal? Any lower DP results in less then 4200mAh's
Help is appreciated
I just bought 2 new packs (4 cell), IB4200 WC's.
I used my CellMaster to charge my packs with the delta settings mentioned in this thread, without any luck. I also use the MM heat sink
The only way I can get close to a full 4200 mAh's is if I turn up the delta peak.
Here is my most recent charge info.
Amps - 6.0amp
Delta - 50
Fan start at 50c
Pack Temp cut off at 49c
These settings resulted with a charge of 4401mAh's which stopped due to DeltaPeak. The temp at cut off was 35.4c and climbed to 37.4c
Can some one let me know why I have to have the delta peak so high? Is this normal? Any lower DP results in less then 4200mAh's
Help is appreciated
12-05-2006, 11:21 AM
#1374
There is no need to use a heatsink at ambient temps in the 60's. All you are doing is supercooling your cells, causing them to lose power. I won't even think about using mine until the ambient temp is in the 80's.
I suppose that using the heatsink when in lower temps could potentially cause the batts to last longer, but IB4200 cells seem durable enough already to withstand being lukewarm
. You just don't want the IB cells to be overheated during charge.
Battery temps should be reaching the 45-50 deg C range as they peak on the charger. Check out our article here:
Summary of MMR Charging Accessories
mAH readings during charge can be deceiving with IB cells. I had old 3300's that could take 4400 during charge. IB cells seem to almost charge quicker as a general rule...their lower resistance may be what is contributing to their high run-time compared to previous cells. Also, we do not equalize IB's as low as we did GP's. It was actually common for some batches of good 3800's to only take 3700 during charge, even if they were equalized to .6 beforehand.
Don't place too much emphasis on the amount of mAH the batteries take during charge. It is just not a consistent reference. The big thing is that the batteries both get a full charge and get up to temperature.
It was doubtful those 3300's I had (that took 4400mAH) would make full run-time in mod. My old 4200's (that take only 4300mAH or so), however, sometimes have over a minute left after a mod race.
5A equalizing before charging can effectively make your pack take more mAH during charge...it can make a difference of up to 400mAH with 4200's in my experience.
I suppose that using the heatsink when in lower temps could potentially cause the batts to last longer, but IB4200 cells seem durable enough already to withstand being lukewarm
. You just don't want the IB cells to be overheated during charge.Battery temps should be reaching the 45-50 deg C range as they peak on the charger. Check out our article here:
Summary of MMR Charging Accessories
mAH readings during charge can be deceiving with IB cells. I had old 3300's that could take 4400 during charge. IB cells seem to almost charge quicker as a general rule...their lower resistance may be what is contributing to their high run-time compared to previous cells. Also, we do not equalize IB's as low as we did GP's. It was actually common for some batches of good 3800's to only take 3700 during charge, even if they were equalized to .6 beforehand.
Don't place too much emphasis on the amount of mAH the batteries take during charge. It is just not a consistent reference. The big thing is that the batteries both get a full charge and get up to temperature.
It was doubtful those 3300's I had (that took 4400mAH) would make full run-time in mod. My old 4200's (that take only 4300mAH or so), however, sometimes have over a minute left after a mod race.
5A equalizing before charging can effectively make your pack take more mAH during charge...it can make a difference of up to 400mAH with 4200's in my experience.
Last edited by Nexus Racing; 12-05-2006 at 09:12 PM.
12-05-2006, 11:25 AM
#1375
Originally Posted by BigJim14226
at what delta peak?
when i am done a heat of racing i dump my packs on my ctx-d on pulse discharge then i put some charge on the about 600 mah for the next weekend . i dont know what you guys are doing but my bateries never go over 39 degries after a fresh charge and i always get 4400 plus mah .
12-05-2006, 08:34 PM
#1378
Originally Posted by BigJim14226
ok.....
just tried the delta peak & .06 after Pulse discharging and Linear discharge to .9
numbers are as follows
4353 mAh
temp 40c
charge stopped due to peak
any suggestions or are these good?
just tried the delta peak & .06 after Pulse discharging and Linear discharge to .9
numbers are as follows
4353 mAh
temp 40c
charge stopped due to peak
any suggestions or are these good?
12-05-2006, 08:42 PM
#1379
temperature is really arbitary.
on a hot day in summer, the starting temp is already 35 deg+
on a cold they start off at 15deg.
really delta peak should be set as low as possible. once the voltages drop, the cells are fully charged, there is no need to charge further.
on a hot day in summer, the starting temp is already 35 deg+
on a cold they start off at 15deg.
really delta peak should be set as low as possible. once the voltages drop, the cells are fully charged, there is no need to charge further.
12-05-2006, 08:46 PM
#1380
Warmer cells discharge harder. I have felt it. It is not night and day but the packs do feel punchier when warm. I agree though. You should not be working to get the batteries hot. Too hot and you can damage them. This is why I think with these new cells a temp probe is so important in case you delta peak is set too high.