idk y people think every other guy in this forum is a liar and a culprit..here are some pics of my ultra swollen wolfpack

but thats an rtf lance,,.. and it was supposed to be used with 11.1v..

check this out urself

http://www.rcbazaar.com/products/1437-super-j3-piper-cub-1070mm-pnp.aspx
1200mah was recommended ..at 11.1 volt.. i used 1250

Out of all the questions I asked you answered one that too because you assume I called you liar while trying to ascertain how the battery looks exactly? Did you read further the warning I was trying to convey?

You have to use the "right" 3S lipo based on the amp draw.  If your setup is sucking 30 amps and 1500 mah 3s lipo rated at 20C will max out at 30 amps, you will puff the battery on the maiden flight.

A 40 C lipo will help but more important, you should prop down to a 7" prop and not just 7" but with a pitch of 3.5 and not more than 5.  

@roby
A closeup of your Deans please.
See mine.

okay :p so what can be done? how can we check if the esc's fine? or the motor? i don't wanna void warranty, if there's any

Something is wrong with your Dynam Cub specs

http://www.nitroplanes.com/60a-dy8927-j3-yellow-rtf-24ghz.html

The same Dynam in Nitroplane is a 1350 KV motor.

If you click on spare parts, the suggested replacement motor are 1200 and 1350 kv. You must prop down.

ur right...i should be using 7.4 v right? its rc bazaars fault, isn't it?

here's my dean kk sir

It looks like you have soldered the dean the wrong way. Look at Mr Iyers pic carefully.
Did you solder deans on both the batteries?

can this be possible? because i soldered it in the esc as well,,, so i am sure that red goes to red
how does it matter if i soldered it the other way in my case? and after 1 successful flight??

What about zippy ??hope zippy 1000 mah comes with 2 Pin Mini JST Plug and zippy compact comes with XT60 connector if you have used dean plug how did you connect zippy.

@roby
Sidewinder responded while i was at dinner.
Red wire on horizontal tab?

Pic of the other side connector too please.
Also pics of the connections for the successful flight.

(Don't get angry, only trying to help)

Okay, confusing. If you have made necessary changes on the esc while soldering plugs, with respect to the dean on battery, then its alright.If you reverse the polarity esc will be damaged. It can further extend to your battery. Anyways there is no way you could have flown on reverse polarity.

On further searching, most of the 20-27 size motors(you haven't told us the size of the motor or make) with 1700kv are not rated for 3s battery and most of them have 8" props suggested with 2s lipo .(first 3 results)
www.google.co.in/search?q=1700kv

So if your motor is something similar to them, then it must have given up during the first flight due to heat because of excessive amp draw/voltage, leading to a damaged esc which may have shorted and damaged your first battery. You must have been flying while all this happened so the crash. Since the esc was already shorted, the moment you plug in the second battery it heats up.

There can be many more scenarios, more info & pics will help.

Dear Member

from beginning Mr roby say he blew the battery and then he say its fine with other electronics.How come he did maiden flight perfect and next attempt this tragedy happens. No connection has been changed


Reason for asking him were you got this J3 Piper cub

http://www.rcindia.org/for-sale/super-cub-pa-18-easy-trainer-for-sale/

he mentioned in this sale post he got J3 cub from hobbyking Australia warehouse. $80+$80 shipping and sold it for 7000 INR Hope every one who ordered from hobbyking know we can buy only from international ware house if we order from India even though we try this will be the message

Attention

You are located in IN but one or more products in your cart are from the Australia Warehouse or Store Front and cannot be shipped to your country. Remove the product from your cart and add the International warehouse item with the same SKU

same way in pic what he posted can view  (dynam) super j3 piper cub.its available in www.rcbazaar.com.

Super J3 piper cub (1070mm)only available in HobbyKing AUS ware house

specification is much different between hobbyking J3 cub and dynam J3 piper cub.like motor,propeller,even flying weight


So MrRoby is not clear from beginning try to say rcbazzar made mistake.

:p Mr. moorthy i made that post to look at the potential of selling j3 cub over here, with a cut of 500 bucks/model...i bought 1 which is a 2nd hand thing... another 1 is from rcb... i have many models..2 days back bought 2 from @theleabres.. and the zippy is also his... maybe he soldered the deans... you have a grudge against me moorthy sir? Why do you want to put me down?? i'm just here to ask a query and you seem to be constantly annoying me

also the dynam is the model i'm talking about here...which is brought from rcb..my brand new j3 cub was sold.. at 2k less than what i paid

reason for blew this the way you reply to members

check all your topics its a public forum Mr roby.If we ask any doubt you reply

 


Now you post

Don't like to pull this issue.Even now you don't accept the mistake.


in sale post it say clearly brand new J3 now you reply used one.So be clear.

i'm just a kid, must apologize on my part. I'm just a bit too  curious cuz spending for a lipo was too much for me.

Roby

when i join this forum zero knowledge about rc but today learnt lot and still lot to learn.Many senior members are here to help us if we are clean and clear they won't let us down.

Go head with your doubts .       PEACE.

@roby
So finally what was the answer to why the lipos burned?

trying to post pics... took 3 screenshots..still its not less than 200kb.. what exactly you want to see?
i'll post in fb and get the links

still got to find that... i think there's sth wrong with esc or motor of dynam from rcb..or j3 cub(they look similar, call them whatever Mr.moorthy...not the hk thing but the rcb thing)
never opened it ... well i wont miss the chance to prove myself when people are stripping me for no reason

viewing to your screenshoot,i think you have soldered wrong wires,+ and - connections are changed by mistake on battery side,check it.