YourMicro.com - HPI Micro RS4, Losi Mini-T, XRay M18, Forums, News, Pictures, Parts, and Shop
Forums, M18, M18T, RC18T, Mini-LST, Mini-T, Micro RS4, XRay, 1/18, 18th scale
M18 Hop-Ups, M18 Parts, Mini-LST Hop-Ups, Mini-LST Parts, Kyosho, Atomic, 3Racing, Country Alloy Works, Castle Creations, Trinity, Intellect, United RC, Battery Packs, 2/3A
  #1  
Old 01-10-2007, 10:32 PM
TheSteve TheSteve is offline
Registered User
 
Join Date: Dec 2006
Posts: 27
The LiPo's I am using

I have tried two different LiPo packs in my Micro-T

The first is a 2S 160mah pack that easily fits in the stock battery compartment. It warms up a little with both the stock motor and a brushless motor. I believe the cells are rated at 7C which is a little low for the stock motor but not too bad with the Feigao 5250kv brushless.
This pack was purchased assembled at a local hobbyshop.


The second is a 2S 250mah pack that will fit in the stock battery compartment as well, it is a little tight though. I found it fit in a little better by shaving down the plastic around the edges of the metal posts that the battery latch screws use. The plastic really isn't required so it makes no difference removing it.
This cells are rated at 10C continuous and 20C pulse and are made by Fullriver. I have a discharge graph of these cells at 4 amps and they hold voltage just fine and still provide the full 250mah of rated capacity. At a 1 amp discharge rate to 6 volts I drained 270mah out of a brand new pack.
These cells were purchased from a website in the UK and I assembled them myself, careful assembly is required to ensure they will fit in the stock battery compartment.
Anyone thinking of buying these cells please only do so if you are familiar with Lithium Polymer cells. The tabs on cells this small are very delicate and you are putting the cells in a very small space!
This pack shows very little signs of heating with the stock brushed motor or my Feigao brushless, they can take the current drain with no problems or voltage sag. In fact battery life is so good with my Feigao brushless I haven't yet fully drained them, I get tired of driving before it happens and I am pushing the truck as hard as I possibly can. My rear tires are nearly bald.

Summary:

Stock pack - 4.8 volts @ 150mah, total power: 0.72 watts, weight: 18 grams, size: 32.3x20.8x11.3mm

160Mah LiPo - 7.4 volts @ 160mah, total power: 1.184 watts, weight: 10 grams, size: 35x20.1x9.02mm

250mah LiPo - 7.4 volts @ 250mah, total power: 1.85 watts, weight: 14 grams, size:34.3x21.1x11.37mm

The clear winner is the last pack, weighs less then the stock nimh pack, still fits in the stock battery compartment with careful assembly and has a whopping 2.5 times the original batteries total power.

For those interested the 250mah cells can be purchased for $7.25 USD each here: http://www.ekmpowershop2.com/ekmps/s...lyer/index.asp

Here are two pictures. First is the 160mah pack, 250mah pack and stock nimh pack. Second picture is the 250mah pack installed in my truck.
Attached Images
File Type: jpg microt076Small.jpg (40.0 KB, 82 views)
File Type: jpg microt075Small2.jpg (46.7 KB, 64 views)
__________________
Surrounded by Mamba's!!!

Last edited by TheSteve; 01-10-2007 at 11:54 PM.
Reply With Quote
  #2  
Old 01-10-2007, 10:36 PM
m18_racer's Avatar
m18_racer m18_racer is offline
Registered User
 
Join Date: Oct 2006
Location: Mid Florida
Posts: 490
Send a message via AIM to m18_racer Send a message via Yahoo to m18_racer
very nice,. there is a new thread where u can post reviews. u can post this there as well. way to go Steve, udaman!
__________________
mini-t
micro-t
m18
mrs4
Reply With Quote
  #3  
Old 01-11-2007, 03:52 PM
alfred's Avatar
alfred alfred is offline
Super Moderator
 
Join Date: Jun 2004
Location: virginia beach
Posts: 10,129
Send a message via AIM to alfred Send a message via MSN to alfred Send a message via Yahoo to alfred
Maybe this will clear everything up with the battery pack for the M T..........im going to also put a copy of this in the review section and make this a sticky.....the one in the review section will be closed though so the members will have to post here.

Get it got it done.......
__________________
Xray M18
MRS4-1
540 MRS4
Spektrumized
Reply With Quote
  #4  
Old 01-14-2007, 06:58 PM
mugmug mugmug is offline
Registered User
 
Join Date: Dec 2006
Posts: 31
>>>> Qusetion for the lipo people<<<<


when running these lipos in the micro T how do you know when to stop before ruining the battery by dropping the voltage too low??? I know the esc does not have a cut off for that.
Reply With Quote
  #5  
Old 01-14-2007, 07:07 PM
TheSteve TheSteve is offline
Registered User
 
Join Date: Dec 2006
Posts: 27
In my case its easy, I am using a Mamba25 which has LiPo cutoff.

Without a proper LVC I'd use a timer or stop running as soon as you notice a lack of power.
__________________
Surrounded by Mamba's!!!
Reply With Quote
  #6  
Old 01-14-2007, 10:13 PM
m18_racer's Avatar
m18_racer m18_racer is offline
Registered User
 
Join Date: Oct 2006
Location: Mid Florida
Posts: 490
Send a message via AIM to m18_racer Send a message via Yahoo to m18_racer
get a LIPOSHIELD it has a soft cutoff at 3.0 volts/cell and costs around 20 dollars.
__________________
mini-t
micro-t
m18
mrs4
Reply With Quote
  #7  
Old 01-14-2007, 11:55 PM
Lostinturn3's Avatar
Lostinturn3 Lostinturn3 is offline
Registered User
 
Join Date: Nov 2005
Posts: 518
Send a message via AIM to Lostinturn3
can you run the 250mah lipo w/ the stock esc/motor?
__________________
AE RC18T
Xray M18
Kyosho Mini Inferno
AE RC10T3
Traxxas T-Maxx
OFNA Hyper 7
Reply With Quote
  #8  
Old 01-15-2007, 05:03 AM
mugmug mugmug is offline
Registered User
 
Join Date: Dec 2006
Posts: 31
Do you know who carries/makes the liposheild? It's kinda hard to find.

yet another piece of electronics we have to squeeze on that chasis. i think for me the final solution will be a different body with more vertical space as I'm not a fan of decasing any of the electronics. for now i ordered a womp womp 1/32 scale vw bug body which apparently fits with mild creative trimming. Hope that will have more space.

http://www.shopatron.com/product/pro...83.11028.0.0.0

By the way I heard it through the grape vine that one of the mini z aftermarket outfits will be coming out with a body that will cover the wheels all together for a sedan look. i hope they go for a Rally type feel.

(i think we need to create a micro-t body tread too)
Reply With Quote
  #9  
Old 01-15-2007, 08:58 AM
alfred's Avatar
alfred alfred is offline
Super Moderator
 
Join Date: Jun 2004
Location: virginia beach
Posts: 10,129
Send a message via AIM to alfred Send a message via MSN to alfred Send a message via Yahoo to alfred
Nice lid....do you know what color scheme you plan on going with....... As for the thread we will have to see about it.....right now its not at the top of the list.
__________________
Xray M18
MRS4-1
540 MRS4
Spektrumized
Reply With Quote
  #10  
Old 01-15-2007, 04:06 PM
m18_racer's Avatar
m18_racer m18_racer is offline
Registered User
 
Join Date: Oct 2006
Location: Mid Florida
Posts: 490
Send a message via AIM to m18_racer Send a message via Yahoo to m18_racer
Quote:
Originally Posted by mugmug View Post
Do you know who carries/makes the liposheild? It's kinda hard to find.

yet another piece of electronics we have to squeeze on that chasis. i think for me the final solution will be a different body with more vertical space as I'm not a fan of decasing any of the electronics. for now i ordered a womp womp 1/32 scale vw bug body which apparently fits with mild creative trimming. Hope that will have more space.

http://www.shopatron.com/product/pro...83.11028.0.0.0

By the way I heard it through the grape vine that one of the mini z aftermarket outfits will be coming out with a body that will cover the wheels all together for a sedan look. i hope they go for a Rally type feel.

(i think we need to create a micro-t body tread too)
i think novak either makes it and if not i know they do make one.. and i know that helihobby has lipo shields... ill post some links in a sec..
__________________
mini-t
micro-t
m18
mrs4
Reply With Quote
  #11  
Old 01-15-2007, 04:11 PM
m18_racer's Avatar
m18_racer m18_racer is offline
Registered User
 
Join Date: Oct 2006
Location: Mid Florida
Posts: 490
Send a message via AIM to m18_racer Send a message via Yahoo to m18_racer
here you go:

http://www.dimensionengineering.com/LipoShield.htm

http://teamnovak.com/products/lipo_c...ule/index.html
__________________
mini-t
micro-t
m18
mrs4
Reply With Quote
  #12  
Old 01-16-2007, 02:52 PM
mugmug mugmug is offline
Registered User
 
Join Date: Dec 2006
Posts: 31
m18_Racer
Hey thanks for the links. The Dimension brand would be the way to go which i hadn't seen before. it seems to be as tiny as can be. I knew about novak's lipo cut-off but I also knew it was way too big for the micro t.
Reply With Quote
  #13  
Old 01-16-2007, 02:56 PM
mugmug mugmug is offline
Registered User
 
Join Date: Dec 2006
Posts: 31
TheSteve,

I'd really would like to buy one of those 250 mah lipos you put together.Payment can be through paypal.
Reply With Quote
  #14  
Old 01-16-2007, 04:35 PM
TheSteve TheSteve is offline
Registered User
 
Join Date: Dec 2006
Posts: 27
Not really planning on selling them at this time. I only bought 4 cells so I could make 2 packs.
__________________
Surrounded by Mamba's!!!
Reply With Quote
  #15  
Old 04-27-2007, 07:36 AM
Ckoz5.0 Ckoz5.0 is offline
Registered User
 
Join Date: Mar 2007
Posts: 27
hell, I'd buy one from you, too. I ruined my first pack somehow. My mamba 25 cutoff was set correctly, but I left the battery connected and the mamba power switch off, yet the batt discharged to 2.3 volts. Now my charger faults out and will not attempt to charge it.

I cant find another built pack anywhere.

Are there any step by step instructions out there to build your own pack?
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
TEK18XX | My TEK18X bigger brother.. Thomas P RC18T Discussion 21 09-14-2008 02:49 AM


All times are GMT -5. The time now is 02:36 AM.


Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright 2007 YourMicro.com
Mini Inferno Sale - Up to $85 Instant Savings!
Micro-T Hop-Ups
RC18R, M18, Micro RS4, Mini-LST, TamTech-Gear, Minizilla, RC18T, RC18B, RC18MT
Mini-Z, Mini-Z Racer, MR-02, MA-010
M18, M18T, RC18T, Mini-LST, Mini-T, Micro RS4, XRay, 1/18, 18th scale
XMODS, XMOD, Micro Flight, ZipZaps, ZipZaps SE, Bit Char-G, MicroSizers, TTTT, Plantraco Desktop Rover, SuperSlicks, Digi Q
Mini Inferno, Mini Inferno ST, half EIGHT, 1/16, 16th scale
Epoch, Indoor Racer, 1/43, 43rd scale
E-Savage, eSavage, eZilla, e-Zilla, HPI
Robots, Bots, Bipeds, Wheeled, Manoi, Roomba, NXT, Lego, Hacking
Crawling, Crawlers, Micro, RC, Losi Mini-Rock Crawler, Duratrax Cliff Climber
Mini-Z Hop-Ups, Mini-Z Parts, Mini Inferno Hop-Ups, Mini Inferno Parts, M18 Hop-Ups, M18 Parts