....can anybody guide me about using 3s lipo on sparrowhawk xxb (stock esc and ripper motor) , because i myself don't know , that will it be safe to use or it will fry the esc and motor .....

FRy....Nothng else, i talked to TTamerica on phone and the guy was kind enough to tell me the same for the same motor and esc on an XXT.Mind it.

i thought of doing so because the 7.4v 2400mah NIMH battery runs only for less that 1 minute ,and when i tries to charge it the charger shows it as full charged after 5-10mins.
what to do.
i have the following battery and charger....
http://www.rcskyhobby.com/products.php?prd_id=137&main_page=products
and
http://rcskyhobby.com/products.php?prd_id=139&main_page=products
plz help........

Confirm whether its 7.4V or its 7.2V

Secondly the same ESC and motor ran upto 15mins on my car with a 2200mah lipo.
So chech ur batteries or charger

Third, Your esc can take a lipo, but your motor bearings are not designed for that power, it will die soon.
More over Ttr hasnt cleared anywhere whether a 3s is fine. Their helpline says no while ESC specs say yes....so better is stick to a 2S 5000mah, you are going to get runtimes of about 1hour on a small track for good driving.

oops ...... sorry its 7.2v , but whats wrong with my case than , the buggy hardly runs for 1 minute.
i checked the battery and charger , both seems to be ok.......

post a video of the whole sseen , that will be helpful

ok......i will upload the video tomorrow

i just checked with my multimeter and made following observations
1) i charged the battery
2) connected the esc and the battery and the motor
3) also connected multimeter parrellel with battery
4) when the esc is turned off , i.e no power flows through the esc the voltage is 8.5v
5) when i turn on the esc and run the motor then the voltage drops to 4v after 40 seconds.
5) again i turned off the esc and multimeter showed 7.4v
6) i turned on again and run motor and multimeter reading dropped to 4v again and then motor stopped.
i guess the battery is the one thats creating the problem.............plz help....

I would say something is wrong with your battery or charger.If it charges up completely and then dies in a minute,something is wrong.

IF you can manage it,get an EZrun combo like 13.5 turn or something and a HK lipo with an accucel-6 charger.

As Arpit said before,3s will fry it for sure.

Its your battery most probably, how old is it...? how many cycles?

its just new.......bought a few days back only...........!!

i m experincing this thing since i used it first time..

Then i suppose the charger is also new,
Its really hard to say then, a video will help, but try arranging a different battery and charger and use them to verify whether your motor and ESC are good enough or not.

Quote from: gurtejtoor on January 22, 2011, 10:51:28 PM
i thought of doing so because the 7.4v 2400mah NIMH battery runs only for less that 1 minute ,and when i tries to charge it the charger shows it as full charged after 5-10mins.
what to do.

I use to have the same combo of battery and charger and it took atleast 4 hours to charger the battery, definitely your charger is faulty, 99%its the charger rest 1% is battery, and your ESC and Motor are fine.

Try finding a new charger 

it may also be like the person from whom i bought the battery gave me an old one with a tag of BRAND NEW......

but after the charger shows that the battery is fully charged , then i checked the battery with multimeter and the reading was 8.5v.

Any development on this?

He should check how many mA is the batt. holding on full charge

I think it can run 3s. Seen here in this video:

But 3s will put too much stress on the components.Lots of power is useless if it is not put down properly.3s just won't work with 1/10 scales on a track.

Yeah thats there.

Hey using 3s will provide better battery times compared to 2s for same speed. So if one gets a 3s and limits the max-throte using ATV setting on radio he will have a much longer runtime right?

Probably, but not suggested.Stick to 2s.No use in limiting the power when you have it.You will be wasting energy.Instead,buy a 2s and be happy.3s is exclusively for speedruns.

Hey how will energy get wasted?

You've got 3s but you're not using all of it.You might as well get a 2s lipo and have a blast.

Oh that way. Anyway the point is 3s can be used on the XXT/XXB but its not of much use