in the assembly guidance the following battery is used :
which the discharge rate used is 30c
and the battery which I bought is this one and in previous question I asked if it’s compatible with the robot and the answer that I should use the 25c battery
is there any harm to use this battery
I’d suspect there is no harm. The voltages and amperages appear to be the same, only the mAH (milliamp hours) are different which translates into slightly less run time. @tec_support can likely confirm this is the case. 
The discharge rate has relationship with maximum discharge current. 25c and 30c have no big difference, since you already have the 30C battery, I think you can try it.
Besides, you may also consult the shop who sells the battery for more professional explanation.
ok I will try, since I bought it from the internet and there is no such local store here the only thing I have is just to try
Thank you
