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Originally Posted by BoxxerBoyDrew
(Post 15968234)
I am also wondering how long do your AAA batteries last before you start to notice they wont "hold their charge" and start to dump with fewer and fewer laps? My wording is probably incorrect, but I have 2 sets of 4 AAA nimh PN900s I have been using for about 10 months, and they used to power the car for almost 15 minutes before you could feel the car starting to loose power to where your giving it more throttle to run the same times. Now after 20 or so warm up laps, I get half way through a 75 lap run and the throttle is super spongy and the steering slows. I usually drive every other day, and I charge after each use with a SkyRC NC1500 charger at 500mah.
So is this a normal amount of time to expect with nimh AAAs? I'm used to running the subC packs from 30 years ago and their lifespan and how they behave, so the AAAs are new to me. Thanks for Any and All Help! I'd be lost without Yalls Help! Drew |
Thanks Traveler2! I figured what I have are about done, so I'm on the search for their replacements. I am planning on 4 sets, and I was looking at the PN750 or Eneloop 800 by going what Others have said, but I will put the Speedhouse cells on the list too!
Take Care and Stay Warm Everyone! Drew |
Originally Posted by BoxxerBoyDrew
(Post 15968234)
I am also wondering how long do your AAA batteries last before you start to notice they wont "hold their charge" and start to dump with fewer and fewer laps? My wording is probably incorrect, but I have 2 sets of 4 AAA nimh PN900s I have been using for about 10 months, and they used to power the car for almost 15 minutes before you could feel the car starting to loose power to where your giving it more throttle to run the same times. Now after 20 or so warm up laps, I get half way through a 75 lap run and the throttle is super spongy and the steering slows. I usually drive every other day, and I charge after each use with a SkyRC NC1500 charger at 500mah.
When I charged my first set of NiMH batteries for my Mini-Zs, I made a similar mistake...I just plugged the charger in, popped the AAAs in, and started charging them. After they were (supposedly) "fully charged", I wondered why the capacity was considerably lower than the stated capacity. I even went so far as to type an email to the battery's manufacturer, complaining that they were defective, and that I wanted to exchange them. Thankfully, before sending said email, I decided to do a little research...and, in doing so, I 'discovered' where/how to set the charging capacity for my new charger (the included "manual" wasn't in English...but, o/l searching found an English translation), changed the setting to match the stated capacity of the AAAs, and charged (actually, I 'cycled') the batteries. And, in the end, they finally had the capacity stated on the batteries. Try changing that setting on your charger, from '500' to '900', and see if that doesn't resolve your "problem". |
Originally Posted by Panther6834
(Post 15968369)
Just curious...but, when you say "I charge after each use with a SkyRC NC1500 charger at 500mah", do you mean you're setting the charger to 500mAh? If so, have you considered that that's the "cause" of the 'problem'? I might be new to Mini-Z, but I'm definitely not new to charging batteries. In setting a charger, whatever the mAh level is that you program into its settings, that is the capacity you are telling the charger to "stop charging". When charging LiPo packs, if I set the charger to...say...5000, the pack I'm charging will typically have a "fully charged" capacity of 5,000mAh, give or take a few. Likewise, if you're setting the charger to 500, chances are, you're only charging those batteries to (approx) 500mAh...not the 900mAh capacity they're capable of.
When I charged my first set of NiMH batteries for my Mini-Zs, I made a similar mistake...I just plugged the charger in, popped the AAAs in, and started charging them. After they were (supposedly) "fully charged", I wondered why the capacity was considerably lower than the stated capacity. I even went so far as to type an email to the battery's manufacturer, complaining that they were defective, and that I wanted to exchange them. Thankfully, before sending said email, I decided to do a little research...and, in doing so, I 'discovered' where/how to set the charging capacity for my new charger (the included "manual" wasn't in English...but, o/l searching found an English translation), changed the setting to match the stated capacity of the AAAs, and charged (actually, I 'cycled') the batteries. And, in the end, they finally had the capacity stated on the batteries. Try changing that setting on your charger, from '500' to '900', and see if that doesn't resolve your "problem". |
Originally Posted by Traveler2
(Post 15968444)
I know Drew said 500 mAh, but I think he meant 500mA. The way most of the AA/AAA chargers work is you set the charging rate, in this case 500mA, and the charger charges until full. I charge at 500mA as well, and most of my health cells charge up to 700-900mAh of capacity. I haven't used the same charger as Drew, but you usually can't set the maximum capacity on these chargers, only the rate of charge.
There is, however, one major exception to everything I just said - "smart" chargers. These are 'intelligent' enough to determine the capacity of the batteries. This also allows the charger to charge batteries of different capacities and/or different types (AA, AAA, etc) at the same time. I almost purchased one of these...except that I decided I wanted to follow the same charging pattern I use for LiPo packs, charging at a lower rate before racing starts, then charging at a higher rate between races. |
Thanks Traveler, yes I meant mA! I had been up a few days and was a bit punchy on the key board! LOL
My charger auto charges and tells me how much the amount of power the battery took, so they are getting fully charged. Unless my charger is lying or dying, it's the batteries. I've run the cycling program on them and it helped, but they are still showing their wear. New batteries are coming. Thanks for the Help Guys! Drew |
I run with a local mini-z club but will try the Mini96 challenge. I should be up and running with a stock and maybe 2wd open class cars sometime in January.
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Class- 2WD Open
Date- December 31 2022 Location- Madison, Wi Race Time- 323.21 Fastest Lap- 3.8s Chassis- Atomic MRT Body- Fiat 500 Abarth Wheelbase- 94mm Tires- Marka Motor- GL 3500kv Batteries- 360mah LiPo Gearing- stock Notes- Car was driving pretty decent today and got a nice run in. Still gotta stay off those walls. Happy New Year!! https://youtu.be/MBjcOzY6f_c https://cimg7.ibsrv.net/gimg/www.rct...b24f9b3c7.jpeg https://cimg6.ibsrv.net/gimg/www.rct...72459ad4e.jpeg |
December Box Stock
Class-Box Stock
Date-12/29/22 Location-Winston-Salem, NC Race Time-262.9 Fastest Lap-3.27 Chassis-MR-03 ASF Body-McLaren F1 LM Wheelbase-98mm Tires-K30LH fronts, Marka V1R10 rears Motor-Stock Batteries-PN 750s Front Springs-PN Red T-Plate-Kyosho Carbon Med Motor Mount-Stock MM Dampener (If applicable)-None Dampener Fluid (If applicable)-K 15k grease on top shock Gearing-Stock Gear Diff/7T pinion Notes-No changes from previous month. Car feels slower than usual, but couldn't figure out why. https://cimg9.ibsrv.net/gimg/www.rct...09b3ad6f51.png https://cimg2.ibsrv.net/gimg/www.rct...57f69d435.jpeg |
December Porsche Cup
Class-RM Porsche Cup Class
Date-12/31/22 Location-Winston-Salem, NC Race Time-265.0 Fastest Lap-3.23 Chassis-MR-03 ASF Body-911 GT1 Wheelbase-90mm Tires-K30LH fronts, Marka 10 rears Motor-Stock Batteries-PN 750s Front Springs-ATM Deep Blue (Soft) T-Plate-Kyosho Carbon Soft Motor Mount-Stock RM Dampener (If applicable)-None Dampener Fluid (If applicable)-None Gearing-Stock Gear Diff/7T pinion Notes-No changes. Only a couple of runs today. https://cimg1.ibsrv.net/gimg/www.rct...596994ff49.png https://cimg2.ibsrv.net/gimg/www.rct...93d888d75.jpeg |
December Stock
Class-Stock GT 70T
Date-12/24/2022 Location-Winston-Salem, NC Race Time-239.3 Fastest Lap-3.03 Chassis-MR-03 ASF Body-Ferrari F-430 GT Wheelbase-94mm Tires-K30 radial fronts, Marka V1R10 rears Motor-PN 70T Batteries-PN 750s Front Springs-PN Purple T-Plate-PN CF #4 Motor Mount-PN 94-98mm v2 Dampener (If applicable)-PN DDS Dampener Fluid (If applicable)-None Gearing-PN 64p 10/54 Ball diff Notes-No changes this month. Noticed chassis cracked and the antenna came off board. Transplant in order. Tried 6 different stock cars this month, but this one was my fastest again... https://cimg1.ibsrv.net/gimg/www.rct...fdcfc2d893.png https://cimg7.ibsrv.net/gimg/www.rct...79efb33f0.jpeg |
Stock
Date-12/28/2022 Location- California Race Time-236.13 Fastest Lap-2.91 Chassis-Pn 2.5 Body- NSX Wheelbase-94mm Tires- R Marka 10. F PN soft slick Motor-3500KV Batteries- Enloop This took so so so many laps to get done under 4 mins. https://cimg9.ibsrv.net/gimg/www.rct...f8b50973f.jpeg https://cimg2.ibsrv.net/gimg/www.rct...19b3025790.png |
Box Stock
Date-12/28/22 Location- California Race Time-254.45 Fastest Lap-3.13 Chassis-MR-030 Body- R8 (actually used my other R8 body but don't have a picture of it) Wheelbase-98mm Rear PN soft radials Front PN soft slick Motor-Stock Batteries- PN750 T plate white fiberglass Front springs red Only did a few runs with the box stock car but all the laps in stock really helped. Wanted to try for a better run but the servo is having issues so this run with probably be it. https://cimg4.ibsrv.net/gimg/www.rct...193bf8557.jpeg https://cimg5.ibsrv.net/gimg/www.rct...f051c2996.jpeg |
2wd open
Date-12/18/22 Location- California Race Time-233.71 Fastest Lap-2.90 Chassis-GLR-GT Body- Jomurema Wheelbase-98mm Rear PN soft radials Front PN soft slick Motor-3500KV Batteries- 2S lipo This car is super easy to drive and had a lucky clean run after only running it a few times. https://cimg6.ibsrv.net/gimg/www.rct...16ab4760f.jpeg https://cimg0.ibsrv.net/gimg/www.rct...16f246417.jpeg |
December 2022 Results
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We had 7 racers posting in 4 classes this month, with some close racing. In Box Stock 1.7 seconds separated 2nd and 3rd and in Stock 3.2 seconds separated 1st and 2nd. And PoorBoy sweeps the top spots in all classes he ran (good thing I ran Porsche Cup)! Box Stock 1st - PoorBoy - 254.5/3.13s 2nd - TAMAK - 261.2/3.25s 3rd - Traveler - 262.9/3.27s 4th - ShawnO - 290.5/3.62s 5th - PaulSW - 301.3/3.51s 6th - ap910 - 398.5/3.97s Porsche Cup 1st - Traveler - 265.0/3.23s Stock Class 1st - PoorBoy - 236.1/2.91s 2nd - Traveler - 239.3/3.03s 3rd - ap910 - 351.2/3.88s Open 2WD 1st - PoorBoy - 233.7/2.90s 2nd - TAMAK - 248.9/3.12s 3rd - TomTheGeek - 323.2/3.80s FTM goes to PoorBoy in his Open 2WD car with a 2.90 fast lap! If anyone was late posting because RCTech was down, please post up and I will update the results. Please check my tabulations and let me know if I made any mistakes or missed anyone. January layout is same as December, but running counter-clockwise! Happy New Year and Cheers, Traveler2 |
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