Batteries

Hi guys.
Best batteries for a featherweight? I know my options (Gel-Cel, Nicad, NiMH ect) but which are best, good value for money, easiest to deal with ect.
Also Ive never been very good with voltages and currents so can someone give me an idea of the best running voltage and that for a good reliable featherweight. Links would be good too.
Cheers. Dave

Dave youve posted one of those how long is a piece of string questions.

Nimhs seem a favourite choice .....voltage and Amp/hrs depend on your motors and gearing.

I did want to know how long a piece of string is...lol.
Its running on drill motors.

a piece of string is twice the length from the middle.

(Message edited by ady on November 08, 2007)

2 drill motors?
4 drill motors?
what voltage are the drill motors?
Will you use a weapon that uses electricity?

All these things we need to know to give the best recommendation.

2 drill motors, not sure on the voltage but Im getting them off James Cooper so Im guessing the standard ones. If I do go with a weapon (havent decided yet) itll be on a separate circuit with a separate battery, so Im just on about for the drive for now.
Its going to be much more of a fun bot than a highly serious competitor for now, Im not building a wedge that has to push all day long. Im just looking for it to have fairly decent speed and power (I know this depends on the wheels as well before someone points that out), be able to last the full battle, and be an easy recharge between.
Also the piece of string advice was very helpful too. lol.
Cheers.

I consider the norm for drill motor voltages to be between 9.6v - 36v.... there isnt a standard voltage.

I think theres a formula to guesstimate the number of knots you can get in the string if all the unknown values add up to 89.

If I was to start a feather like that:

For drive, 2 drillmotors of 9,6V to 12V, I would put 2 NiMh racing packs of 7,2V around the 2000mAh to 2400mAh mark in series so you would get 14.4V. It is easier to find good inexpensive chargers for 7.2V racing packs than it is for 1 14.4V pack.

Add these to a Scorpion (X)XL or a Sabretooth controller, and attach those very nice blue wheels that James Cooper sells and your ready to go.

Thanks Leo, yes thats pretty much what I plan to do. :)

Hi, Its question time... Again
Where do you guys get your battery packs made? Id be looking for somthing in this sort of layout with all the cells stood up like those battle packs. like these.
http://www.component-shop.co.uk/assets/images/150_8vp3700sc-w.jpghttp://www.component-shop.co.uk/asse...vp3700sc-w.jpg

i need somthing roughly 12v 4300mah and either 14.4v 4300mah+ or 18v 4300mah+
Cheers Fellas