Wawa:
You have already mentioned this battery in your other thread.
Is my power supply sufficient enough? - Motors, Mechanics, Power and CNC - Arduino Forum
You could have asked it there.If you want to charge a 12volt SLA battery, then connect a 12volt SLA battery charger to it.
I always get nervous when powering an Arduino with more than 9volt (>= 13.5volt in this case).
The 5volt regulator on the Uno could overheat, depending on what else the Uno has to power.
You might want to power the Arduino with a 5volt buck converter (on the 5volt pin).
Leo..
can i use this sir? for the 5v pin?