Hey when you cycle batteries do you think it will effect numbers if you put the pack on a fan for discharging?

Yes it will affect the no's. It is supposed to be in a consistent room temp. when cycling batteries.

Ummmmmm that is imspossable.


what I am talking about is put the pack on a fan for the discharge only

I think it will affect the numbers a little, but if you are just looking to find your best packs and you do it the same every time for every pack it is all relative. When the pack is discharging on the track there is moving air through the body of the car anyway, probably a lot more than we think. I dont like letting a pack sit on the table and cook with no cooling air at all while cycling, i always use a cooling fan when cycling, it cant be good for the cells to just sit there and heat up....

I think if you are clycling your batteries to find your best packs, I wouldn't use a cooling fan on packs. But if you are just cycling your packs,I would you a cooling fan on the discharge only, cooling the batteries when charging may affect the peck detect of the pack, possibly causing it to overcharge.

I know not to use it on charge. I agree with Mayham on this one I think that as long as I cool only on discharge and do it the same with every pack it will be fine.

Dave I would like to know why you want to do this? You will not be able to put a fan on a pack when you run it in a race. In fact if you want to keep it more like race conditions I would cycle the pack wraped in a towel at normal room temp. I have yet to see a case where we get a pack to hot from dischargeing. You have to figure mod guys discharge a pack on average of 50 amps (probally more) over a 4 min run. The heat generated while just sitting on a table dischargeing at 30 or 35 amps will not hurt a pack in any way. Feel free to try things out, however what you decide to do just keep it consistant it's all relative in the end.

-Monti-

I was just concerned about the heat created from the discharge.

Dave I would not worry about it. Everyones packs are "tuffer" then they think. These packs are nothing like the 1200's or yellow cells we used to run back in the day. They can take tons of punishment.

-Monti-

A pack coming out of a car after a run is normally about 110 to 120 deg. A pack being cycled on the bench with no cooling can easily reach 170 deg. That puts the internal temps well over that... so far over that the internal chemicals can come close to becoming liquid.

I have said for years that cycling packs just to cycle them is the most harmful thing you can do to them. If they need to be cycled, put them in your car and run them. That will tell you far more then any sort of cycling numbers can ever tell you.

the only reason I cycle packs is when they are going to sit for more than two weeks.

Hank I do concour with your final thought.

Dave I have had packs sit for over a month and have not noticed any loss in performance at all.

-Monti-

Cycling just to cycle is just one less run your pack will deliver. I only cycle when i suspect a pack is dropping off, or when i rematch, which i am finding is a GREAT way to get some really hot packs after 10 cycles or so. i used to run for probably the biggest battery matcher out there, and i remember him telling me that when they started matching at 30 amps with the new turbo matchers, they would see broken shrink wrap occasionally from the high dis. rate with no cooling air on discharge. They modified the matchers to cool the cells so the shrink wouldn't melt. Never run a fan, or have moving air while charging. Personally, i let the discharge cycle go for 45 secs. or so befoore starting the cooling fan upon discharge.

hankster - I couldn't agree with you more. Customers constantly ask me if they should cycle their new packs. I tell them no! The cells have already been cycled MANY times, they do not need to be subjected to any more excessive heat. One person even told me he cycled a brand new pack 5 times to "break it in." That is 5 less race cycles he will get from that pack.
Mayhem - You are correct, when grading cells at 30 amps it is not uncommon to see shrink wrap splitting. Most of the time the cells come off the matchers too hot to touch. After all the punishment cells are subjected to during the matching process, why would anyone want to punish them more by pack cycling?

The only excepton to this may be spec packs,if you cycle a new spec pack you will notice that it takes a few runs to get it to come up to snuff.These packs aren't matched so I don't think they've been cycled at the factory.But also in the past with normal packs I've always noticed that it seems to take a few 1-2 runs to get the best out of them,is this because they are adjusting to your type of racing? the first run without any cycle's on a new pack always seems flat.

You Guy's Have alot to learn about this subject. :confused:

You Guy's Have alot to learn about this subject. :confused:
Enlighten us.

Weapon !. Well Put It on use.There ain't a day goes by that i could use to learn something new.So Spill the real deal. Fill us in, (On we have alot to learn!!!!!!)

One thing that most everyone knows (so this is for the newbies) is if you cycle in a cold room say in a basement which is 55-60 degrees, versus a room at normal temp of 70-75, the colder room will show lower numbers than a wamer room.

That is why West Coast and Southern guys always have such high numbered stout packs, it's warmer there, than up here in the North, brrrr LOL

the average discharge rate is now 52.5ampsor a little more depends on runtime 350 at 35 amps works out to 52.5 amps for a 4 minute run in MODIFIED racing ,,,,I always cycle my packs for the first run ,and get the numbers and then no more cycling until the pack falls off....and becomes a practice pack .....


172 degrees is way to hot so I would also use a fan on discharge

ROCKET

Newbie here with a question. I just bought a car and got some 4 cell packs with it. The guy said they sat for about 1 month what do I need to do to get them woke up?
Thanks

Try cyceling them on a turbo 30 or 35 and then deadshort them and you are ready to run them ......If you need info on how to cycle just ask ...



rocket

Rocket no turbo 30. So what else can I do ?
Thanks

smokefan just run them, best way to cycle is on the track.

Anyone having this problem with their turbo 35? I set my 4 cell packs for a cycle. Charge at 6 amps, discharge at 25. On all my packs the charge time is exactly 2221 secs. Anyone else running into this? Am I getting a full charge?

Danny from SMC said that the turbo has a time limit on the charge. let the pack charge about 600 sec then really quick hit stop then start.

some of the 30s don't have the prompt[i think thats what its called] in them to handle 33's,they will only go to 3000mah. contact CE for the piece,it's [was] 25$ plus shipping you can install yourself.got mine about 6months ago,it was doing the same thing,now its fine.

You must be dead shorting? if so use the long lockout and charge at 6.5 amps then you wont time out at 37 minutes, at 6.5 amps your charge time will be around 30 minutes.The old software times out at 37 minutes.

Thanks! That is what it is.... I am just gonna put a charge on them first, then let them sit for a little bit before i cycle them. The numbers were a LOT better! So thats why I was so slow in Branford? (Yea Right)



You must be dead shorting? if so use the long lockout and charge at 6.5 amps then you wont time out at 37 minutes, at 6.5 amps your charge time will be around 30 minutes.The old software times out at 37 minutes.