[LBRC]

Originally Posted by Stompers Rule!

Hi. I'm thinking about buying one of these Micro-T's and putting a Li-Ion battery in it. But first, I have a few questions:

I do recommend getting a Micro-T, they are great fun and a must have for any Micro/Mini enthusiast. However I also recommend holding off on a 7.4volt lithium setup until you are absolutely sure you want one. Since I don’t know how familiar you are with lithium batteries in RC cars; I do not recommend them for anyone who is unfamiliar with them, their safe handling, and additionally their limitations.

Would a couple of these 3.7v batts fit in there?

Fit? Yes. Work? NO. The el-cheapo 170mAh LiPo you are referring to has a 2C (2 times the rated Capacity) maximum discharge rate that’s 0.34 amps max while the Micro-T motor easily draws over 2 amps. Even when used in parallel (2p) for a 3.7volt pack you are still well over 1 amp short in the way of performance and especially safety. Anything less than 210mAh with a 10C discharge is a waste of time and even then it’s not enough for a good 2s 7.4 volt pack. Basically for a 7.4 volt LiPo if it isn’t at least a 250mAh 10C forget it.

How does a 3.7v 2P pack work since the ESC requires 4.8v?

Simple, the ESC doesn’t require 4.8 volts. It works great at 3.7 volts especially with a lithium battery where that 3.7 is a nominal value the cells are charged to 4.2 volts and drain down to less than the nominal 3.7 as they discharge.

Is there a 3.7v 2P pack on batteryspace?

Don’t know I’ve never looked for one, but my guess would be no.

Which one of these PCB's should I use? They limit the current draw from 5v up to 9v and I don't know which would be best for a 7.2v 2c pack. What about for a 3.7v 2p pack?

And you plan on putting this where? Generally we don’t use this type of circuit for micro RC car applications primarily for size but also because of their internal resistance. They are use and required for cameras and such that use low end chargers. Functionally they disable the pack if the voltage drops below safe limits when discharging or above safe limits when charging, often permanently, and should not be confused with hobby type lithium battery low voltage protection circuits which temporarily turn off the pack before it is discharged below preset limits. For safety hobby grade chargers like the Duratrax Ice or ElectroFly/Great Planes Triton have better circuits installed in the charger itself instead of the pack that do much the same thing. How do you know when your car needs charging? Simple, when it slows down. With a good hobby type lithium charger the only thing you need to do/worrey about/remember to do is to turn off the car and/or unplug the pack and charge it when you are done driving.

Will you post a pic of the comm drop hole you drilled so I know where to drill mine?

http://lbspd.com/v-web/gallery/albums/album149/Hole.jpg

Lastly, how often do you add drops?

As needed, that depends on your car, motor, and driving.