View Single Post
  #1  
Old 01-10-2007, 09:32 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 10:54 PM.
Reply With Quote