Bought a flysky th9x LIPO from RCBAZAAR.com

M unable to charge it using my accucel 6. Currently using cheap simple charger to charge it but the battery is not holding proper voltage.

Does anyone know what balance plug is used to balance charge this lipo and where to get it?

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Hi,
On Turnigy Accucel 6,
Click Type Button and select ""LiPo BATT"
Then Press Start Button
now in this option press Left or Right Key and on screen select "LiPo Balance"
and press Start Button, Now select mAh of Battery and Number of Cells
Then Hold Start Button for Long
It will confirm and your configured battery type and detected battery type, if both are same press start button

Now About Connection:-

Connect Red and Black wire in Charger output, on right side of charger and also insert blance plug in charger

In picture, battery seems 3Cell

The issue is of balance lead!!

Are you able to charge it without Balance ??

Yup!
Bt unable to find which balance plug it uses??

your battery blance plug is 4 pin mean 3 cell so connect it to 4 pin male connector on charger right side.