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Old 2008.01.28, 04:08 PM   #1
JC@TSR
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Team Scream Racing Matched 900 Mah Min Z Cells

Hi Everyone The ask Team Scream Racing Forum is up and running. I will do my best to answer every question in a timely manner and to the best of my knowledge.
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www.teamscreamracing.com
978-337-0429
1/12 Stock Cleveland US Indoor Champion 2007
18 Time 1/18 Off Road National Champion
18 Time 1/18 On Road National Champion
26 Time East Coast Champion
RCX 2WD Stock Mini-Z Champion
2008 RCX F1 Stock Mini-Z TQ/Champion
2008 RCX Pan Car Mod Mini-Z TQ/Champion
2008 19T UK National Champion
2005 Stock UK National Champion
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Old 2008.01.28, 06:41 PM   #2
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Hey great cells. I ran them in my last race, and had great results. I am planning on getting a few more sets, and use these cells for all of my heats and mains.

How many cycles would you recommend running in a race night before the cells start to run flat?

What would the highest amperage charge that the cells could reliably take. I have been charging at 1A on my Maha charger, but cells off that charger dont seem to run as fast as cells charged at 1A on other chargers.

I have never charged in series, only with smart chargers (Duratrax 30 minute, Energizer 15 minute, and Maha MH-C9000). I have only used your cells in my Maha charger, since I want to make sure not to charge them at a high amperage. I know the Energizer is way too harsh on cells, and I usually only use that one to repeak cells before heats. I am also planning on getting a Lacrosse BC-900 to help maintain the cells (I run many classes, so I need lots of cells.

I usually only fully cycle the cells once a week. It would be nice if you could write a small tutorial about maintaining these cells properly for long term use and to keep them performing top notch.

I usually use cells for a point series, charge them harsh... then the next series I would get new cells. I am trying to avoid doing that with these cells, since they are matched and should last a bit longer than unmatched cells.
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Old 2008.02.02, 03:33 PM   #3
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I will have a full set of care tips for these cells up soon. I have been matching like a mad man so I can fill the preorders I have.
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John at Team Scream Racing
www.teamscreamracing.com
978-337-0429
1/12 Stock Cleveland US Indoor Champion 2007
18 Time 1/18 Off Road National Champion
18 Time 1/18 On Road National Champion
26 Time East Coast Champion
RCX 2WD Stock Mini-Z Champion
2008 RCX F1 Stock Mini-Z TQ/Champion
2008 RCX Pan Car Mod Mini-Z TQ/Champion
2008 19T UK National Champion
2005 Stock UK National Champion
2006 4 Time BRCA UK Champion
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Old 2008.02.13, 05:00 PM   #4
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Cell Care

Here is battery charging and care info I was going to post.

PERFORMANCE CHARGING

(1) Charge at 1.0 amp with a high end charger such as a GFX, LRP, Tekin Etc.
(Our testing shows that the Power X and Lacross style Chargers false peak cells.)
(2) Peak Detect setting is .30-.40 MV
(3) After Running your cells discharge them at 3.0 amps to .90 volts per cell.
(4) Equalize the cells just before you charge them for best performance.

CHARGE RATES TESTED

We have tested these cells at a 2.0 and 3.0 charge rate. I will do 4 and 5 today to see how they do. They handle the 2.0 and 3.0 very well, the only down side is the IR goes down and you loose some runtime. With 5 min races this should not be a problem.

STORAGE

I have left 8 cells sitting since I started matching the cells. The numbers were 1.25 and today they were 1.22 and 1.23 after 30 days of sitting. I would put a 5-15 min. charge in the cells if you plane on storing them over the summer. Just to be safe I would also check the voltage every 30-60 days in each cell. I do not see these cells self discharging from what I have found.

I will do my best to keep up with the questions. If for some reasone I do not answer a question fast enough please call me at the number below.
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John at Team Scream Racing
www.teamscreamracing.com
978-337-0429
1/12 Stock Cleveland US Indoor Champion 2007
18 Time 1/18 Off Road National Champion
18 Time 1/18 On Road National Champion
26 Time East Coast Champion
RCX 2WD Stock Mini-Z Champion
2008 RCX F1 Stock Mini-Z TQ/Champion
2008 RCX Pan Car Mod Mini-Z TQ/Champion
2008 19T UK National Champion
2005 Stock UK National Champion
2006 4 Time BRCA UK Champion
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Old 2008.02.13, 05:59 PM   #5
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Sorry about the speeling errors in the last post. Spelling Check does not work when you copy and paste it.
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John at Team Scream Racing
www.teamscreamracing.com
978-337-0429
1/12 Stock Cleveland US Indoor Champion 2007
18 Time 1/18 Off Road National Champion
18 Time 1/18 On Road National Champion
26 Time East Coast Champion
RCX 2WD Stock Mini-Z Champion
2008 RCX F1 Stock Mini-Z TQ/Champion
2008 RCX Pan Car Mod Mini-Z TQ/Champion
2008 19T UK National Champion
2005 Stock UK National Champion
2006 4 Time BRCA UK Champion
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Old 2008.02.13, 06:54 PM   #6
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Thank you for posting this up. Lots of good info! I do have some questions though.

On the Battery performance, what do you mean by equalizing them before charging it? Like discharge them to certain volt. like .90 then charge it? (sorry newbie here) FYI I have lacrosse and ICE charger.

For storaging the battery, I have 4 cars that I race everyday and have like 20 sets of batts. I don't get to use all of them so they end up sitting on my box for a week... is it better for the battery to sit fully charged or .90 discharge? Common sense tells me I have to have them charged since NiMH self discharge right?

Please advice. Thanks!

-TJ
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Old 2008.02.13, 11:45 PM   #7
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Thanks for the info JC.

So the LaCrosse false peaks. Argh, I just ordered one a couple days ago. Or do they peak early, and run a top off cycle like other "smart" chargers.
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Old 2008.02.14, 12:53 AM   #8
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From my experience, they don't all false peak on the Lacrosse. You have to run a fan blowing on them constantly to make sure the temp. sensor does not shut off the charge. Batteries will only charge fully if they are kept cool while charging. I use both a Eagle CDC V.7 (same as ice, etc) and a Lacrosse to charge and I always get a full charge for both. You will always get a higher overall voltage peak if you charge your cells individually v. in series. You just have to monitor your batteries on the Lacrosse. Most batteries should peak in between 1.49-1.56/cell.

I know for a fact that the Maha does not have as high as a cutoff as the Lacrosse, leading to "false peaks". Which essentially means a lower delta peak.

I too have found like John, that the .40 cutoff is ideal. I used to have false peaks with my CDC before I started charging with the higher cut-off.

Remember that the Lacrosse and Maha are not Hobby grade chargers, they are meant to be used with electronics such as camera equipment where the demands for a "hot" peak is not as important.

So don't give up on the Lacrosse, just run a fan over it...

High amp (2-3A) charging will just lead to a shorter battery life and eventual leaking/ possible explosion. IT IS NOT SAFE TO DO THIS. The difference in power is negligible if any on the track, not only that, it is irresponsible to charge a battery at these rates. Don't mean to discredit John, I have not tested his cells, but I know AAA batteries at 900mah are not designed to handle these kind of charge currents. High charge rates will lead to leaking and possibly explosion. (hence the reason why 750mah intellects, which are really 550-600mah do this at 1A charge). Don't make Mini-Z dangerous for yourselves. The equivalent of charging a AAA 900mah battery at 3A is about 15A for a sub C 4800mah(1/10th scale batteries).

If you want a little more power, go to around 1.2 A/ charge...
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Last edited by CristianTabush; 2008.02.14 at 01:01 AM. Reason: typos
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Old 2008.02.24, 06:29 PM   #9
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Sorry for the delay everyone, I really need someone to help me at that shop with things so I can do better with the forum.

A equalizing tray will take the cells down to .90 volts. This will allow the cells to perform at their best.

Storage should be just as I stated in my other post. These cells do not discharge very fast, so if they are going to sit for a short amount of time a 5-10 min charge should be a safe one.
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John at Team Scream Racing
www.teamscreamracing.com
978-337-0429
1/12 Stock Cleveland US Indoor Champion 2007
18 Time 1/18 Off Road National Champion
18 Time 1/18 On Road National Champion
26 Time East Coast Champion
RCX 2WD Stock Mini-Z Champion
2008 RCX F1 Stock Mini-Z TQ/Champion
2008 RCX Pan Car Mod Mini-Z TQ/Champion
2008 19T UK National Champion
2005 Stock UK National Champion
2006 4 Time BRCA UK Champion
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Old 2008.05.30, 03:27 AM   #10
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Should I break in these cells with Maha C9000? It is necessary or not? thanks
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Old 2008.05.30, 04:03 AM   #11
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I would just cycle them 2 times. 1A charge/discharge. These cells are cycled to match them, so in a sence they are already broken in. I was hitting at least 850mah discharge on every cell on the first charge-discharge. The refresh/test cycle is great for new cells, and is not nearly as time consuming as the break in, which takes a day and a half.

If I am near my charger when cycling the cells, I will charge/discharge manually. The MHC9000 has a rest stage, when using the cycle or refresh function, it will rest for an hour between charging and discharging.
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Old 2008.05.30, 08:25 AM   #12
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These are the same cells that BILL CROTTY used to win several classes @ the RCX Race in California last month
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Old 2008.06.01, 09:36 AM   #13
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TSR Matched 900 Mah AAA's

One or two cycles will be fine to get the cells at their best. You should be all set after that. Let me know how they work for you.
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John at Team Scream Racing
www.teamscreamracing.com
978-337-0429
1/12 Stock Cleveland US Indoor Champion 2007
18 Time 1/18 Off Road National Champion
18 Time 1/18 On Road National Champion
26 Time East Coast Champion
RCX 2WD Stock Mini-Z Champion
2008 RCX F1 Stock Mini-Z TQ/Champion
2008 RCX Pan Car Mod Mini-Z TQ/Champion
2008 19T UK National Champion
2005 Stock UK National Champion
2006 4 Time BRCA UK Champion
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Old 2008.06.03, 10:20 PM   #14
aphit89
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I try to break in with Maha Charger MH C9000. I don't know this is false data or not but I found two of the cells goes to around 1200 mah. Is this a good news or not? thank you
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Old 2008.06.05, 09:41 PM   #15
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Yesterday I just try TSR matched and Orion 900HV matched R1Wurks.. I found Tsr is more punchy than orion.For the running time both of cells almost the same. This is my experience...How about you guys?
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