R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 08-26-2005, 01:45 AM   #16
Tech Regular
 
DIMO's Avatar
 
Join Date: Mar 2005
Location: TEAM SMA
Posts: 321
Default Listen To This

WooooooopS got it way off wasnt thinking right.....DO NOT USE THAT METHOD....

SOrry Guys....

Last edited by DIMO; 08-26-2005 at 08:32 AM. Reason: Got It Wrong
DIMO is offline   Reply With Quote
Old 08-26-2005, 01:59 AM   #17
Tech Master
 
Join Date: Nov 2003
Location: Florida
Posts: 1,154
Trader Rating: 1 (100%+)
Default

Only having the pack at 5.4 volts and then dead shorting "not always", but "can" cause possible cell performance problems, and especially for the guy that forgets to use solder as the short (that will pop if the load gets to be too much) and by mistake, uses regular wire one day.....bringing the pack safely to true zero, (or "most definitely" below .90 volts per cell) before dead shorting....is not only way safer...but offers the same benifits when deadshorting.....most of the horror stories you hear about dead shorting come from guys that don't bring the pack down to zero before putting the short on ........get some good packs, and upkeep equipment like the equalization trey and the turbo 35 BL you have on the way, before you go the deadshorting route
__________________
1/8 Scale: Tekno EB-48.2... Tekin RX-8 GEN-2 W/2050kv... Airtronix M11-X Radio... HiTec HS-7954SH Servo...

1/10 Scale: Associated B-5(rear motor)...Tekin RSX Gen-2 W/8.5t... Savox SC-1258-TG Servo

Last edited by Joe B; 08-26-2005 at 02:11 AM.
Joe B is offline   Reply With Quote
Old 08-26-2005, 04:12 AM   #18
Tech Elite
 
Cole Trickle's Avatar
 
Join Date: Sep 2001
Location: Denmark / Europe
Posts: 2,571
Default

Quote:
Originally Posted by DIMO
Hey Mate Trust Me On This Technique..

Discharge Your Batts down to 5.4 Volts on your ice. Then Stick a Piece of solder from the + to the -. This is dead shorting. WOrks well on GP 3300.
Leave the Solder Piece on over night. Dont worry it wont blow up,

From there you should know how to set your charger.
MAKE SURE YOU TAKE THE PIECE OF SOLDER OF OR BOOOOOOM LOL
6amp Charge
Trickle OFF
8mv Per cell or 48mv per pack
and charger her up

My 3300s are still quite beasty although i have upgraded to Intellects. I would definately do that.. Still run my GPs to.

DONT DO THIS !!!

If you want deadshortning, then you FIRST have to equalize all the way down to zero, so you are absolutely sure, the pack is empty, BEFORE deadshortning.

However, deadshortning is suspected/known for shortning pack life - and since your packs already are past their good point, I wouldnt even consider deadshortning. If anything, I would deadshort as the absolutely last thing to try, before recycling the packs.
__________________
Schumacher Mi5 - Sanwa MT-4 / RX-462 / KO Propo PDS-2123 - Nosram 5600 X-treme Saddle Pack - LRP SPX Zero/X12 17,5 - Nosram Stealth Touch Evolution - MAAS SPS 9250
Cole Trickle is offline   Reply With Quote
Old 08-26-2005, 05:50 AM   #19
Tech Fanatic
 
Join Date: Mar 2005
Location: Sydney, Australia
Posts: 948
Default

Quote:
Originally Posted by DIMO
Hey Mate Trust Me On This Technique..

Discharge Your Batts down to 5.4 Volts on your ice. Then Stick a Piece of solder from the + to the -. This is dead shorting. WOrks well on GP 3300.
Leave the Solder Piece on over night. Dont worry it wont blow up,

From there you should know how to set your charger.
MAKE SURE YOU TAKE THE PIECE OF SOLDER OF OR BOOOOOOM LOL
6amp Charge
Trickle OFF
8mv Per cell or 48mv per pack
and charger her up

My 3300s are still quite beasty although i have upgraded to Intellects. I would definately do that.. Still run my GPs to.
Do not, i repeat do not try this at home!!!!!
Rody is offline   Reply With Quote
Old 08-26-2005, 05:52 AM   #20
Tech Fanatic
 
Join Date: Mar 2005
Location: Sydney, Australia
Posts: 948
Default

.

Last edited by Rody; 08-26-2005 at 05:53 AM. Reason: posted twice.
Rody is offline   Reply With Quote
Old 08-26-2005, 06:38 AM   #21
Tech Regular
 
pyrosian's Avatar
 
Join Date: Jan 2005
Location: Jets Sports Club, Tempe
Posts: 356
Default

As has been said already deadshorting from 5.4 volts will destroy your packs, in fact you wouldn't even have to solder the wire on as the voltage would arc weld it for you. Dead shorting MUST ALwAYS be done from ZERO VOLTS and all cells must be equal.

I discharge packs at 20amps down to 5.4 volts and leave them there. I get good performance out of my packs this way along with good life. Rody is a team-mate of mine who takes his cells down to zero and has more punch than me (and better packs ) each to their own, do whatever your comfortable with.
pyrosian is offline   Reply With Quote
Old 08-26-2005, 06:42 AM   #22
Tech Master
 
LosiSuperTruck's Avatar
 
Join Date: Jun 2005
Posts: 1,080
Trader Rating: 18 (100%+)
Default

Thanks all for the response.

I have borrowed a Trinity discharger from a friend and will try it later tonight, he said it will take them all ot .9 volts. I will also solder of some new lead for the charger\battery. I use Deans plugs.

So these packs are crap? The guy on ebay said they were in "like new" condition He also included 10 sets of tires that are useless, would be lucky to get half a run ouf of them. Now I have to hunt down some packs before tomorrow

So the steps to discharge\charge the battery are:
1. Use the charger to discharge.
2. Use Tray to finish discharge.
3. Use charger to charge at 5A.

Is this correct? Then after this I should cycle to see the discharge rate?

Also, I have a brand new 1900mAh batter that came with the charger, would this provide as much power as the 3300 for a stock motor, what about runtime?

Thanks
LosiSuperTruck is offline   Reply With Quote
Old 08-26-2005, 07:01 AM   #23
Tech Elite
 
Cole Trickle's Avatar
 
Join Date: Sep 2001
Location: Denmark / Europe
Posts: 2,571
Default

Quote:
Originally Posted by LosiSuperTruck
So the steps to discharge\charge the battery are:
1. Use the charger to discharge.
2. Use Tray to finish discharge.
3. Use charger to charge at 5A.
4: Discharge @ 10 amps, and read the numbers.

Sad that some people, cheat, while selling

About that 1900 pack: My son got a RC boat, which came with charger, battery, radio etc. In short: Ready to run. It was a no-name NiMh 2000 pack. It actually produce quite impressive numbers. Of course not as good as GP3300, but still very good. Cant remember the excat numbers, but they were so good, that I would say the boat, radio etc, was free included with a reasonably battery.

If I were you, I would simply cycle that 1900 pack, and see if the numbers is reasonably.
__________________
Schumacher Mi5 - Sanwa MT-4 / RX-462 / KO Propo PDS-2123 - Nosram 5600 X-treme Saddle Pack - LRP SPX Zero/X12 17,5 - Nosram Stealth Touch Evolution - MAAS SPS 9250
Cole Trickle is offline   Reply With Quote
Old 08-26-2005, 08:54 AM   #24
Tech Master
 
LosiSuperTruck's Avatar
 
Join Date: Jun 2005
Posts: 1,080
Trader Rating: 18 (100%+)
Default

Thanks again for the response.

What type of "off-the-shelf" pre-assembled pack would you recommend? I am kind of in a bind, I need batteries for the weekend and don't think the LHS has any matched packs. They do have some no-name single cells, but not sure what to look for and I have little experience soldering.

Kind of thinking I will just sit this race out and try again next year. Not too fun if I won't be competative

Thanks
LosiSuperTruck is offline   Reply With Quote
Old 08-26-2005, 09:03 AM   #25
Tech Master
 
kerry's Avatar
 
Join Date: Jul 2003
Location: Alberta, Canada
Posts: 1,157
Trader Rating: 1 (100%+)
Default

don t sit anything out. check out all the lhs in your area, if all else fails someone in your club would be able to lend you a few packs for the weekend just ask. the local club should be helping promote the hobby in any way shape or form. if your lhs doesn't have any batteries then give them hell they are there to support what they sell, not just order them in when someone needs something. hope someone steps up so yo can race this weekend
kerry is offline   Reply With Quote
Old 08-26-2005, 09:11 AM   #26
Tech Master
 
LosiSuperTruck's Avatar
 
Join Date: Jun 2005
Posts: 1,080
Trader Rating: 18 (100%+)
Default

Kerry,
In your opinion, I would not be competative with my packs? This is a trophy race with money involved and not a club meet, I doubt anyone will lend me batteries so I can beat them.

Also, what number are "good", you all agree my numbers are bad, but what is "good" numbers for a pratice pack and race pack?

Thanks All
LosiSuperTruck is offline   Reply With Quote
Old 08-26-2005, 09:22 AM   #27
Tech Elite
 
Join Date: Feb 2005
Location: auburn washington
Posts: 2,053
Default

to answer your first question, how can you tell if these are good? strap them in and drive. all those numbers are good for comparing, but you can't know how its gonna preform until you run it.
Turtlemaster is offline   Reply With Quote
Old 08-26-2005, 09:26 AM   #28
Tech Master
 
Join Date: Nov 2003
Location: Florida
Posts: 1,154
Trader Rating: 1 (100%+)
Default

For GP3300's Anything in the 1.170 + range , at or over 400 runtime, 2.6 (or so) actual resistance....is pretty good.......1.180's and 1.190's with 435+ runtime and 2.2's resistance packs are at the top of the line for the matched GP3300 packs..and are a little harder to come by
__________________
1/8 Scale: Tekno EB-48.2... Tekin RX-8 GEN-2 W/2050kv... Airtronix M11-X Radio... HiTec HS-7954SH Servo...

1/10 Scale: Associated B-5(rear motor)...Tekin RSX Gen-2 W/8.5t... Savox SC-1258-TG Servo
Joe B is offline   Reply With Quote
Old 08-26-2005, 09:45 PM   #29
Tech Regular
 
RandomFellow's Avatar
 
Join Date: May 2005
Location: Plymouth, MI
Posts: 311
Trader Rating: 3 (100%+)
Default

Quote:
Originally Posted by LosiSuperTruck
Ok, I set the charger up to discharge at 10A and charge at 5A. I had time to cycle 3 batteries. Battery 3 was not cycled.

Cap Charged @ 3.3A Cap Charged @ 5A
Battery 1: 2507 2375
Battery 2: 2954 2701
Battery 3: 3523 ????
Battery 4: 4002 3104

Average voltage for B1=6.485V, B2=6.534V, B4=5.456V
Peak voltage for B1=9.382V, B2=9.290V, B4=9.395V
Battery Resitance Average B1=102, B2=94, B4=???? (battery was dead when charged)

Looks like it really hurt the capacity of the pack by charging at 5A

I have a Novak Smart tray on order, but until then I can only discharge by the charger. I need them for this weekend, any ideas. Does my data look bad?
I'm sorry Losi, but HOLY SH##, those packs are crap! I like Cole Trickle's idea the best: take those packs apart, run each cell through a cycle, and match up the batteries with the best numbers (yes, the Ice will do single cells). It will take a while, but you might end up with a couple of decent packs. If you're using the Trinity Real Time, the tray lights will go out at 0.9 volts, but the tray will keep discharging if the batteries are left in. I wouldn't mess with any deep discharging or dead-shorting at this point, just try to get the best cells out of those packs and condition/equalize them using the tray.
RandomFellow is offline   Reply With Quote
Old 09-12-2005, 12:23 PM   #30
Tech Adept
 
Deeds's Avatar
 
Join Date: Jun 2005
Location: Batavia, IL
Posts: 241
Trader Rating: 10 (100%+)
Default

Can someone post some good gp3300 number off the ICE? I think I have 3 packs that are toast. The last race I was at the car was just flat. I could keep the hammer down through the whole infield. I run stock touring. I discharge at 30A till .09 per cell. Slap them in the smart tray, when the lights go off and pack is cool I charge at 6A, .4 cutoff. Pack temps are around 90-130. My smart tray could be garbage because the 4th light from the left always goes off in the first 3-4 seconds regardless of which pack I put in there??

What setting should be used for rating (matching) single cells on the ICE?
Deeds is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Is this a GOOD Battery ???? sparkzilla500 Radio and Electronics 1 07-20-2008 02:45 PM
is this battery good enough? jeramiemaza Rookie Zone 7 05-21-2008 06:21 AM
whats battery is a good battery to run? TroyTroy Electric Off-Road 1 02-19-2008 06:45 PM
This a good battery? Snipesr82 Electric Off-Road 4 04-07-2007 09:22 PM
Good battery and charger surrealmaterial R/C Items: Wanted to Buy 0 08-04-2006 04:42 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 12:35 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net