R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 03-17-2012, 06:06 AM   #1
TRG
Tech Initiate
 
TRG's Avatar
 
Join Date: Sep 2011
Location: Club:- LCRCCC ;
Posts: 43
Questions?? LipPo Battery size for TC

I'm thinking I might start racing again soon, but I need to replace my batteries now. So I'm after some help. What size LiPo batteries should I buy?

I'll be running on road 1/10 TC mainly 17.5T and then some 10.5 classes.

I don't what to waste money buying 6000mAh 65C LiPo's if I don't have to. But I don't want batteries that will let down the performance of the car.

What do you suggest????????

Trevor
TRG is offline   Reply With Quote
Old 03-17-2012, 06:54 AM   #2
Tech Addict
 
Lessen's Avatar
 
Join Date: Jan 2008
Location: Aurora, OH
Posts: 594
Trader Rating: 2 (100%+)
Send a message via MSN to Lessen
Default

I've read that for 17.5 you probably don't need anything more than 40 or 45C constant so that's what I went with. I just picked up some Turnigy nano-tech 4.2's but I won't be at the track for a few weeks to see how they run. The main reason I went with 4200's is simply dimensions. My JRSXR is limited and I found that most 40C 5000 packs are a bit too thick, although there are a few 20 or 25C packs that fit. 4200 is also about 50g lighter, not that it's going to help me at this stage
__________________
"Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. "
Lessen is offline   Reply With Quote
Old 03-17-2012, 07:54 AM   #3
TRG
Tech Initiate
 
TRG's Avatar
 
Join Date: Sep 2011
Location: Club:- LCRCCC ;
Posts: 43
Default

Quote:
Originally Posted by Lessen View Post
I've read that for 17.5 you probably don't need anything more than 40 or 45C constant so that's what I went with.

Do you know if 45C constant is enough if running 10.5 ????????
TRG is offline   Reply With Quote
Old 03-17-2012, 07:55 AM   #4
Regional Moderator
 
CarbonJoe's Avatar
 
Join Date: Jul 2006
Posts: 2,661
Default

5000 mAh 40C are fine for 17.5. Most of the bigger C discharge ratings are difficult to reach, regardless of the battery companies' marketing claims. As far as brands, most if not all of the cells are made in China, so purchase from a label you feel comfortable with. Because in the end, the package dimensions and label are all that most "battery" companies really design.

There is a thread on here where the owner of SMC tested a bunch of manufacturer's batteries, and the best were really around 40C, regardless of the sticker on the pack. Take that for what it's worth.
__________________
*** The Gate - Celebrating 8 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
CarbonJoe is offline   Reply With Quote
Old 03-17-2012, 08:51 AM   #5
TRG
Tech Initiate
 
TRG's Avatar
 
Join Date: Sep 2011
Location: Club:- LCRCCC ;
Posts: 43
Default

Quote:
Originally Posted by CarbonJoe View Post
5000 mAh 40C are fine for 17.5. Most of the bigger C discharge ratings are difficult to reach, regardless of the battery companies' marketing claims. As far as brands, most if not all of the cells are made in China, so purchase from a label you feel comfortable with. Because in the end, the package dimensions and label are all that most "battery" companies really design.

There is a thread on here where the owner of SMC tested a bunch of manufacturer's batteries, and the best were really around 40C, regardless of the sticker on the pack. Take that for what it's worth.
Isn't everything made in China these days.
I think I'll stick with the brands my local shop stocks.

Can you post a link the thread regarding the batteries test that you refer to.
TRG is offline   Reply With Quote
Old 03-17-2012, 09:05 AM   #6
Regional Moderator
 
CarbonJoe's Avatar
 
Join Date: Jul 2006
Posts: 2,661
Default

Quote:
Originally Posted by TRG View Post
Can you post a link the thread regarding the batteries test that you refer to.
http://www.rctech.net/forum/electric...ue-c-rate.html
__________________
*** The Gate - Celebrating 8 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
CarbonJoe is offline   Reply With Quote
Old 03-17-2012, 03:36 PM   #7
Tech Regular
 
Craig W's Avatar
 
Join Date: Sep 2010
Location: stoke on trent
Posts: 488
Trader Rating: 1 (100%+)
Send a message via MSN to Craig W Send a message via Skype™ to Craig W
Default

if you are budget gens ace 5000 50c and they are on brca roar list
__________________
Orca www.ChubbiesCarShack.co.uk TDX SMC RC Airbrush Fundecal
Craig W is offline   Reply With Quote
Old 03-17-2012, 04:38 PM   #8
Suspended
 
Join Date: Feb 2011
Posts: 6,240
Trader Rating: 1 (100%+)
Smile

I run a gtb 3.5t system in a tc4 with a TP 4200mah 40c pack with no issues whatsoever ... No punch or top speed problem here, even at the end of a 6minute run ! I also run a Tp 3200mah 40c in my brushed(monster 27t) tc4 stock tc with no runtime or speed issues... The 65c lipos I have did not yield anymore speed than the 40c's, just more weight to carry around the track ....
bertrandsv87 is offline   Reply With Quote
Old 03-17-2012, 07:06 PM   #9
Tech Regular
 
dirtman71's Avatar
 
Join Date: Aug 2011
Posts: 307
Trader Rating: 4 (100%+)
Default

40c would be plenty for a 17.5. you might want to consider the weight to balance to pick the mah. you might need to run a 5000mah or bigger. if you run a smaller 3600 or 4200 you might have to add weight. would rather have the extra punch of the bigger battery than some extra lead
__________________
Kyosho SC-R, RC8Be, Jammin X1CRe, Jammin SCRT10, RC10GT2, T4.1
Slash 2wd ChuckWorks slice B2, E-maxx, RC10T3, Tamiya M-05, TA-05
dirtman71 is offline   Reply With Quote
Old 03-17-2012, 08:44 PM   #10
Tech Master
 
Mr RCTech's Avatar
 
Join Date: Dec 2005
Posts: 1,291
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by Craig W View Post
if you are budget gens ace 5000 50c and they are on brca roar list
Try the Turnigy nano batteries and you will find that the are better then
the Gen Ace batteries.

C-rating means nothing on labels these days.
Its all about voltage drops under a load.
Voltage is speed!
Mr RCTech is offline   Reply With Quote
Old 03-17-2012, 09:23 PM   #11
Tech Addict
 
Lessen's Avatar
 
Join Date: Jan 2008
Location: Aurora, OH
Posts: 594
Trader Rating: 2 (100%+)
Send a message via MSN to Lessen
Default

Quote:
Originally Posted by Mr RCTech View Post
Try the Turnigy nano batteries and you will find that the are better then
the Gen Ace batteries.
Good to hear. I just bought 4 of them. Not ROAR approved though.
__________________
"Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. "
Lessen is offline   Reply With Quote
Old 03-20-2012, 08:32 PM   #12
TRG
Tech Initiate
 
TRG's Avatar
 
Join Date: Sep 2011
Location: Club:- LCRCCC ;
Posts: 43
Default

Quote:
Originally Posted by Craig W View Post
if you are budget gens ace 5000 50c and they are on brca roar list
The gens ace look like a good way to good if they were not out of stock.
Also I found a "UltimateRC" video that implied that you can no longer get the battery with direct 4mm banana plug connections.
Is this true??????

Thanks everyone for the information as I feel that if I go with a battery of 40C, the battery will not be the weakest link of my drive system.

All I need to do is to source availability and price of a listed approved battery.
TRG is offline   Reply With Quote
Old 03-20-2012, 09:08 PM   #13
gom
Tech Adept
 
Join Date: Jul 2011
Posts: 147
Default

Quote:
Originally Posted by Mr RCTech View Post
Try the Turnigy nano batteries and you will find that the are better then
the Gen Ace batteries.

C-rating means nothing on labels these days.
Its all about voltage drops under a load.
Voltage is speed!
+1
gom is offline   Reply With Quote
Old 03-21-2012, 12:20 AM   #14
Tech Master
 
samnelso's Avatar
 
Join Date: Aug 2011
Location: Fitchburg, MA
Posts: 1,751
Trader Rating: 1 (100%+)
Default

My 6500 60Cs are way way faster (like .1-.2s per lap at ~10s per lap) than my 5000 40Cs. Just saying.

Also, for an fyi, even though I have not been paying all too much attention to my usage during a 6min 17.5 NT TC, I'll estimate the usage at 2600mah.

I'd get some good packs if you're going to be around for a while and plan on being competitive. I know, I know that driving will get you 99% there, but...
__________________
Team Associated | Reedy | Airtronics

RC Excitement: Fitchburg, MA | RC Madness: Enfield, CT | Horsham RC
samnelso is offline   Reply With Quote
Reply



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 07:46 PM.


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