Originally Posted by BeetleBailey
There is one cell that is about a half second slower than the rest. Other that that one, they all dimm at about the same time.
.5 seconds is nothing... However.... your batteries are discharging way too fast so it is hard to tell without graphing them at a lower amp rate.
Yet, this will not cause the problem you are having.
Overdischarging batteries is worst than to just leave them alone.
Although many people are going crazy over the 030, IMO it is NOT the best way to discharge batteries. Yes, the clamps are very NEAT, but it discharges at a very high rate and the lights are useless in my opinion. They go off at 0.4 volts, which is allready too low for some IB's. By the time you taken them out the batteries can be down to 0.2 volts since it is still pulling over 12 AMPS at 0.4 volts. That is just WAY TOO MUCH.
Even at 0.1volts the 030 is pulling 3 amps. This is asking for trouble...
Once a battery reaches 1 volt, the rate of discharge is exponential, thus extremely fast. It only takes <10 seconds to go from 1.0 to 0.9v at 30A. And the 030 pulls 30 amps at 1 volt... 36 amps at 1.2 volts...
At this point it looks like you might have caused irreversible damage to the IB's. This is not because the IB's are bad cells, it is because the cells were abused one way or another.
Now, I want to make something clear, there is a misconception that the GP's are more robust than the IB's. This is not completely true.
Each battery has it merrits and each should be maintained the right way. The problem is that many persons overdischarge the cells and that causes damage. If maintained the right way, IB's can last as long as any other cell in the market. We have team drivers using 4 month old packs and they are noticing a slight decrease in POWER. I make our team drivers keep and race their batteries for an entire racing season so that we can find better ways to maintain them. If they get new packs every month, we can not perform the right tests and figure better ways to make batteries last.
The idea is that if you spend your $$ for racing packs, they should last...and that is what we aim for.
Well, I just wanted to bring this point because many people are overdischarging their cells and then complain that IBs are not good cells.
Bailey, how are the cells performing at the track?
Lets forget the charge/discharge times for a moment...
BeetleBailey, if you want to PM me I will be glad to see how I can help you to bring the cells back. If it is possible at all.