Guys I have a doubt..I have the following battery,I wanna know which connector I should solder with ESC.Thank you.

well i am a beginner but i can insist you the following...(seniors please correct me if i am wrong) by seeing the picture...i guess it is a 3s lipo...i will suggest you to use a "XT60" connector...because i use the same for my 1000mah battery
regards

tejas,i have some other lipos which bought from hk.they came with pre soldered xt60 connector but this one has different..

yes krish , some batteries come with xt60 connectors connected to them (by default)..but if not then we have to solder them ourself...if you have these connectors then well and good, if not you have to buy these connectors from shop, these connectors cost  :Rs:45 per piece...
regards
tejas

man i know about xt60 and i have a lot of them but this battery has a different one pre soldered and no wires r left to solder..

Krish,

your battery came with a JST connector and you need a matching opposite JST male connector on your ESC. This connector is used for low current applications because they are lighter and smaller than other connectors. If your ESC has an XT-60 male connector you can replace the battery's JST connector with a female XT-60 connector.

Husain,

I am not discouraging the pro, but the battery have a safe discharge value in addition to the voltage. Just consider the wire cross-section of ESC Power and the battery terminals. So, the battery is not made for high discharge capacity. So taking high discharge current more than it's capacity generate gassing inside the cells and may explode.

If we ashume, that the battery is 2S (7.4 volt) and motor is 120 watt, ESC efficency is 90%, current would be 18A without considering the BEC. So taking 6A/sqmm current dencity, you need minimum 3sqmm cu wire instead of the thin wire(1sqmm). Again, the insulation is of PVC but not silicon/temperature withstanding material.But if the thin wire is made by silver by the pro, then it's OK.

Moreover, the LiPO specially in series needs balance charging with ovecharge protection for each individual cell, but no balance charging terminals found here.

So, I doubt that pro means here programmer instead of professional. 

An ESC manual is given herewith. It's my turnigy.

800mAH at 20C would be 16amps (in theory, and upto 24amps if you consider the 30C burst rates).... so better to change the battery connector to something that can handle higher current than JST (which is typically rated for around 5A to 10A). 

Be careful when you cut battery connector wires, cut one at a time and do NOT let the exposed wires touch each other.

thanks Rao sir,so the male jst connector is available locally?

which one would u suggest anwar? One more thing,can i use this with 25A Esc or should i go for 20A one?

If you are getting a new ESC, it seems to make sense to get a higher amps one. 

Regarding the connector, there are many choices, including XT60 and deans (and possibly micro deans if you have weight concerns).  Depending on your intended application (and the rest of your power system), you may be able to get away even with JSTs.

http://rchobbyaddict.com seems to have JST stuff.

i'm gonna use this in my HK250GT heli and i have 25A Esc..

I had purchased quite a few Lipos that came with JST connectors, I have replaced all of them with XT60. I have multiple ESCs with different ratings from 12 ams to 40amps - so having one type of battery/esc connector works for me.

Pankaj