Damjan94:
in attachments there is a drawing on how I connected my latching dc valves.
- please don't hijack.
- the image you posted may do well in an art gallery, it gives no useful info on how things are connected.
A 3 Ohm resistance looks very much like a short circuit for many batteries - you get 3A at 9V, 4A at 12V. Definitely a short circuit for 9V block which can supply just a fraction of that.
To extend life maybe you should increase the value of that charging resistor further - 1k and your current is down to 9 mA. That way you should be able to trigger the solenoid once every 20-30 seconds (that's the time it takes to recharge a 6800 uF cap), and you can not trigger more than one solenoid every 20-30 seconds as you don't want more than one capacitor charging. Furthermore, if you have more than one solenoid (and more than one such cap) you need some electronic switches that allow you to charge them one by one upon startup.