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Old 10-09-2004, 09:07 PM   #1
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Lightbulb unmatched vs matched

Hey guys,
Recently, I picked up some SMC matched cells (1.17's). I got em soldered together by a guy at my LHS because my soldering iron is unreliable. Black magic causes it to cool off and heat up randomly... Anyhow, I have a Novak Millenium (courtesy of Ron Meloni, thanks Ron) which of course tells me the pack voltage. My unmatched pack of GP3300's peak at around 9.3 (Or at least they did... 'Till the damn cell died... ). My SMC pack peaks shy of 9 flat. I can noticably tell a difference between packs, and the unmatched pack has more punch. So my question is: Was that unmatched pack a very good set of cells, or does SMC cells just plain suck?
Thanks in advance,
-Josh
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Old 10-09-2004, 09:14 PM   #2
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Sometimes a new pack has sat for a while and needs to wake up. Run it a few times and then see. More than likely it will pick up after a couple of charges.
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Old 10-09-2004, 09:31 PM   #3
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The matched pack should peak lower. The higher the peak charge voltage, the higher the internal resistance. It normally does take 2-4 cycles before the packs come to life. That pack may have sat in the shop for awhile. So it hasn't gone through any cycles lately.
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Old 10-10-2004, 12:08 AM   #4
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dway100 is Exactly right....my best packs peak at 8.80 to 8.90.....and they usually perform best after after 3- 5 cycles...also make sure to "always"equalize your matched cells before charging
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Old 10-10-2004, 08:17 AM   #5
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Josh - You may have gotten lucky on the umatched pack. That is very rare. The thing is on a battery pack, your pack is as good as the worst cell. It will keep the best cell from performing it's best.
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Old 10-11-2004, 01:52 PM   #6
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Quote:
Originally posted by Joe B
dway100 is Exactly right....my best packs peak at 8.80 to 8.90.....and they usually perform best after after 3- 5 cycles...also make sure to "always"equalize your matched cells before charging
Most chargers volt reading aint calibrated... so it's hard to compare from charger to charger, even within the same brand...
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Old 10-11-2004, 02:42 PM   #7
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I recently won an Orion Gp3300 sp version unmatched stick pack at a Hobby People race & it has more punch & runtime than my best 1.17+ Fukuyama packs, i took the pack & turned it into a saddle/ matched pack configuration, it is now our best pack out of ten matched packs, guess i got lucky twice!
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Old 10-11-2004, 02:50 PM   #8
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does anyone know how to match batteries themselves .....this may be a realy dumb questions but i am boarderline rookie in rcing
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Old 10-11-2004, 03:02 PM   #9
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For me.... hmmm.... buying matched cells give me peace of mind because I'm confident the cells are good and identical.

However, buying normal stick pack ( un-matched ) is okay too, I've seen some of my friends won first and second in tamiya mini cooper race with normal stick pack, while I end up third using the matched

The key ( this is just maybe or assumption ok? ) you should race with 98 - 99% new battery to get max power. Matched cell would loose it's punch below 90%. and they are becoming less powerful than the newer cells even un-matched.

Correct me if I'm wrong
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Old 10-11-2004, 04:08 PM   #10
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Quote:
Originally posted by gspot69d
does anyone know how to match batteries themselves .....this may be a realy dumb questions but i am boarderline rookie in rcing
Its not a dumb question anyway bro.. If you really like to matched batteries by your own way theres no problem compare to buying the matched one. The hard part of it is buying or looking for the same specs of the batteries in your LHS then solder them on..
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Old 10-11-2004, 08:15 PM   #11
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Quote:
Originally posted by gspot69d
does anyone know how to match batteries themselves
The only way I know how to match batteries yourself is to get either A) a Turbo35 GFX (or something like that), or B) Get one of the matching units that SMC/Orion/Reedy use. But there may be more. I'm not sure. Heck, with all the posts we might as well start a discussion about matched/unmachtched and what your pros/cons for each are. I'll start:
Unmatched- For me, My unmatched packs (which have now turned into one matched pack, after the cell died in my really goo unmatched pack.... ) Are/were very good. My unmatched that is still good is close, but still ahead of my matched pack in terms of peak voltage (about a .2-.25 volt difference). The bad part is, it is a gamble on if your getting good cells or not.
Matched- You know exactly what you are getting, like ASW said. Also, I like how the car dies, as if you just turned the power switch. It looks really cool to be going full throttle then the car slows down to like 2 mph. Just my one cent... (I'm not worth two cents... yet )
-Josh
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