For a project I am looking for a lead-acid (or other) 12V battery that can handle currents from 0-2A with peaks of 6-10A. It should last at least an hour. Size doesn't matter, as long as I can take it with me. My budget is ?40, but less is preferred 
For longevity of the battery you should look to limiting depth of discharge to no more than 20% of capacity.
So if you want 1 hour at a nominal mean of 5 amps you need a battery of 5x1/.2 or 25AH. This should be capable of giving a peak of 10 amps without too much dip.
I would suggest an SLA (sealed lead acid) golf caddy battery might meet your needs - and becasue it's sealed , and be inverted without losing its contents - though ideally it should be used the correct way up.
jack
The prize structure might be different in Europe; but what I have in my catalogs is:
7.2 Ah 17 Euro 2.6 kg
12 Ah 38 Euro 3.8 kg
24 Ah 79 Euro 8.6 kg
Kung Long is a little bit cheaper than Panasonic
Would a 10AH battery be able to withstand 10A?
;D Of course it will! Think of cranking motors!
BTW:You will always find valuable information in datasheets
Thank you!
And what loader should I use?
Before you can accurately determine the battery size required (to avoid both over and undersizing) you really need to establish what your load profile trully is.
For example 0-2amps means didly squat. Do you mean mostly 0 or mostly 2. Occassionally 6 to 10 means what - a spike once a blue moon or regular and sustained loads of these values for periods of time.
jack
And what loader should I use?
The load depends entirely on your application. I would ask what load do you have or what load do you need.
The load depends entirely on your application. I would ask what load do you have or what load do you need.
I think he means "charger".
Yeah, you're right Sorry, I'm not a native English speaker...