Intellect 4200mah cells
 

Hi,

I was wondering what are good numbers for matched Intellect WC battery after a charge??

Mah:
Peak voltage:
Temp:

Somebody has this info (I searched but couldn't find this info!)

Thanks:)

no real hard & fast figures but i hope this helps

Mah: this varies according to charger used & age of batteries & how you low you balance them to. I go to 0.9v on a NST & see 4400+ mah going in.

Peak Voltage: again age of batteries counts 9.1v to 9.3v for good ones. Higher for batteries that are well used.

Temp: I charge to 45c, temp in batteries rises to about 52c when charge has stopped

Hi,

I have the following numbers with my battery's so was wondering if it's any good?

Mah: 4480
Peak voltage: 9,180
TEMP: 45
Equalising to 0,9V

Thanks

#'s look OK

which charger are you using?

I'm using a Much More Ctx-C charger and a Novak smart tray Se.

All looks good there, nothing to worry about at all. On my Millennium I got peak of 9.22 on a brand new pack of cells yesterday when trayed from 0.9v on a smart tray.

I can do 280 secs in 4wd with 8.75V in my cells as proven yesterday:D

Think it's time you got some NEW cells AND a NEW charger Lee;) :D :D

The higher the peak the better or is the mah reading the most important?

Thanks

Higher the peak means more resistance in the pack : less voltage / punch on discharge.

Normally as packs get older the peak voltage goes up.

MiCk B. :-)

So resistance is not good for a pack if I understand correctly?

I have 2 pack with the following numbers:

4380mah
48°
Peak 9,112

4320mah
47°
Peak 9,89

Wich on is the best?

Sorry for all the questions I'm a newbie who is learning! :wtf:

Don't get too hung up on charger readings. It is a very imprecise way of measuring pack performance and they change depending on the charger settings. Cells are matched on discharge, with calibrated industrial quality equipment for a reason!

While the Cell Master is a very good charger it is not something I would stake my life on when it came to cell readings!

It is fine to compare among your own packs over time though. If you notice that the packs are starting to take significantly less charge capacity after being equlaised, or if the peak voltage is significatly higher than if was before (and I don't mean a couple of thousandths of a volt), then it is probably an indication that the pack is past its best.

My first gen IB4200 cells are knackered now after nearly 2 years of use and misuse, charge capacity is down to 3500mAh on the Cell Master and peak voltages are way up in the 9.3V+ region. I can't even charge them at over 5A anymore otherwise they heat up a colossal amount.

Then again you will realise when a pack is past its best because your car will be slower!

Virtually all the fresh Intellect cells are pretty similar in performance (assuming it is not a dud), even the gap between the best matched cells and the worst is only a couple of percent.

Be confident that all your new packs are better now than they will ever be, and in real terms as good as the best packs anyone you will race against has.

Intellect recomend a max of 4.5amp charge. Overcharging is why they keep blowing up...

not best pleased with my 6 new packs:mad: 3 packs have 3 cells down in each,and 3 packs have a cell down in each:( tried charging duff cells at 1 amp individualy as suggested by mirage,but to no avail:( shouldn't have to do this in my opinion,brand new matched packs at end of the day. think these high capacity packs might be a backward's step at the moment:confused:any how sent them back to mirage.

If you have a duff cell seperate it from the pack and put it accross a 12v battery for a second to give it a kick up the arse, then put it in the pack , equalise and try again.;)

And stegger yes the futaba decided to stop working just before the final, thanks to dan/chris for the 600 seconds of charger usage;)

You didn't overheat them when soldering or something like that? I have never heard of that many going down for one person in one go.

I had at least one cell in each of my last packs. It depends how long they've been sat on the shelf with these new super cells that self discharge like a rabbit with the shits :(

G

try the new east powers, there blomin ace
we just got some new TRINITY EP4200'S
ran them at southport omg im livin em

Too right there, EP's rule!!!!!!!!!!!!

Intellect does that mean IB4200?

They make them....

no,just solderd them like previous packs ive had,never had this problem before:( you raise an intresting point though:wtf: because when you read the writing on cells it says no direct soldering on cells:confused: so i thought,how do they expect them to be put together:confused: so i then had a read of my (the buggy book ,by bill burkinshaw)from a bit back and he states soldering direct on cells should never be considered.back then when you wanted to knock up your own saddle packs,you bought a stick pack and cut the spot welded tags in half joing the cell ends together,and it was these tags that you soldered together again to rejoin cells in saddle pack formation.my point here is this avoided direct soldering on cell ends,so why dont the loose cells we buy now have pre spot welded tags on to help prevent cell's been damaged. thought it was worth raising the point.

i would have thought spot welding would do them more damage than soldering anyway? surely welding requires far more heat than soldering, they don't weld together by magic :o

All commercial battery packs have their cells welded together using either nickel plated steel or nickel straps. The process is resistive welding and incloves very high currents for very short periods of time. The reason hobby people solder cells together is that we dont have access to welding equipment. The soldering process can damage the cells internally.

The problem with buying pre-tagged cells is that making the connection between the two would be rather tricky as you woudl need to solder a third link between the two already on the cells. Ideally, the cells should be supplied with the links's pre welded to the cells. The type of link required already exists and is used for power tool batteries.

The best way to avoid damage is to sand the ends down a bit to rough them up, this helps the solder stick much quicker and easier and use a very hot high quality iron, if your not 100% confident you can solder them safely get someone else to do it, some companies now offer a soldering service for minimal fees.

i guess it's continuously being exposed to heat rather then actual temperatures that damage them?

I have always found that if you are fast with a hot iron then they don't know what's hit them.

Basically the cells resistance will stop the heat from travelling through the cell. Using a weak iron will heat up the whole cell before heating up the contacts to the required temperature.

I think another reason spot welds aren't used in racing batteries is because the welded tabs are incredibly thin and don't carry the current as effectively as teh chunky battery bars we are used to.

Of course, as well as soldering the cells we also massiveley exceed the charge rate compared to the manufacturers recommendations, no wonder they don't survive the 500/1000 cycles in the specs!

The cells we use are not capable of delivery hunderds of full 100% cycles. Cells such as Sanyo 1900SCR (RC2000) and 2400SCR (RC2400) are capable of this performance, but cells pushed to high capacity such as GP4300, IB4200 etc cannot cycle 500 times. It might say it in the data sheet but 100% cycles cannot be obtained. The IEC standard for cycle life is not actually a full charge and discharge and so helps ther manufacturer obtain a higher cycle count number.

Links capable of 30A+ are available, they are the links used on professional powertool batteries (Makita, Bosch Blue, Dewalt etc). These guys are as concerned as we are about making every tenth of volt available at the battery terminals and so have developed materials and processes which are suitable for these high rate applications. You can also weld copper braid to the cells but this is difficult, requires very very high current and a water cooled welder.. we used to do it at our factory in Mexico but it was a pain to make repeatable.

on a seperate note... I hear from my contacts in China that there is a new version of the IB4200 coming out this month which is meant to have better life. Also, GP4300 is available again. If anyone is interested, please drop me a PM. Will people go back to the GP cell if they are obtainable?

N

i won't not unless they increase there performance to at least match the ib's

just received 6 brand new replacement packs from mirage:) very pleased:)hope this batch is a okay:rolleyes: