I am trying to remove the DC/AC power input and soldering onto it a PP3 connector.
I was able to remove the DC/AC power input but wasnt able to find where to solder the + and - wires to the arduino board
I am using an arduino uno board
The Arduino does not have a DC/AC power input.
It has a barrel jack input that should be fed with 6.5V to 12V DC only.
A PP3 is absoloutly useless for most projects, it just doesn't have the current capacity, for it to last very long.
If you must the + is where the centre pin of the barrel jack, the - is the outside connector.
If you insist on using a PP3 (see #2), it's surely unwise to hard- wire the connector in since that will limit your ability to use any other power source. The few times I've used one on an Uno I used one of these, which still gives the wiggle-room to use other sources:
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so it is possible to make but the battery drains quick ?
Yea i need to solder it on so these pp3 connectors with the barrel jack bit dont work
How long do you expect your Uno to operate on that smoke alarm battery? You should expect your battery to last a few hours at most, much less if you're using shields, LEDs, or other power-consuming devices with your Uno. That may be fine, or it may be unacceptable, it depends on your application. You might be able to stretch it longer using power-down methods, but I'm not familiar with the Uno in that application space; others can advise.
It's also a needless waste of energy: the regulator in the Uno will drop the 9V to 5V and so you get (9-5)i = 4i watts as heat.
As I understood, the PP connector through the adapter did not work for you - why do you think that the soldered one will work better?
The PP3 battery is not suitable for powering the arduino
Mine did 
I suppose they come in different grades....
The genuine Arduino UNO has 3 mounting pins on the power connector. Two of those pins go to ground, the third goes to a diode that then feeds the voltage regulator. Should not be too difficult to figure out just looking at the board.
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I would not have taken the trouble to actually remove the power jack, the wires can be easily soldered to the bottom of the board with the jack in place, or you can use the pre-existing VIN and GND on the header to feed power in.
Nop.
I did mean the barrel jack adapters, not the PP3 batteries, just in case you thought I meant the latter. I had no trouble with a bunch of adapters I got from the local hardware shop.
Yes I know. The answer is that they are all the same, there are no grades to it.
But, IIRC the barrel connectors come in two types: 2.1mm and 2.5mm center pin diameters.
Yes indeed. Your point is?
A 2.5mm female will not connect with a 2.1mm male.
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