batteries

[dan da man]

my batteries keep dying in the middle of races i am wondering if it is my pinion or my batts



thanks dan

[stox217]

what batteries you running & what gear?

[dan da man]

i have 4200 batts and i 16 tooth spur and a 6.5 motor

[jim76]

how do you charge them also? is the transmission on the car free or stiff?

[dan da man]

i put then on a cycle charger and diss charge

[dan da man]

and yes the diff is free

[stox217]

how old are the 4200's?

[dan da man]

they are not very old

[stox217]

what amp's you charging at? or what cutoff is your esc set at?

[dibble34]

hard to say really. I run my d4 with a 4.5 on a 16 tooth and it will do 5 mins on some older 3300 cells. Is you motor getting hot? You could try a bigger pinion i guess like an 18 but not sure if that would help.

[dan da man]

i charge them at 3 amps and i dont know what the cut off point is

[jim76]

what charger do you use? does it tell you how many milliamps are going into the cells? Or how long do they take to charge at 3A?

[jim76]

is the entire transmission free, not just diffs? take off the pinion and roll the car along the floor, it should run along happily, not stop abruptly.

[stox217]

i would try 4.2amp
and deffo try to find the cut off point as it may be cutting out on you hence its stopping half way through
what esc you running?

[dan da man]

i use a cml charger it is like the venom charger . it take just over a hour to charger the batts

[jim76]

the cells should be taking over 3000mah then, which is enough for a 5 min race easy. does the motor or speedo get really hot during a run? do you mesh your gears properly and not too tight?

[Jonathan]

Does it do this on more than one pack of cells ? You could have a bad pack or bad cell within the pack ?

[dan da man]

ok then i will try thank you very much

[dan da man]

yes it does do it on more than one set of batts

[stox217]

Id try a diffrent charger for starter's more like a protrak i have for sale (http://www.oople.com/forums/showthread.php?t=24597)
As your cells may dump due to lack of charge in them?