I apologise if this insults anyone's intelligence, but I've always believed the only stupid question is the one you don't ask, so here goes...
As a bit of background, I asked previously about powering a 60w heating element (10v 6A to be precise) and was advised the problem would be solved by using a bigger battery and this turned out to be the case. I bought a lithium polymer battery rated at 12v 10000mAh and that worked, and I heartily thank all of you who helped me with this.
My new issue is this - my (admittedly limited) understanding of battery terminology is that the Ah rating of a battery is how many amps the battery will supply for one hour, so for example a 5Ah battery will supply 5 amps for one hour, 2.5A for two hours and so forth.
I believed that, as the heater needed 6A (or 60w) to operate, if I bought a 12v 8000mAh battery, that would power it, but it didn't; the overload protection on the battery kicked in and prevented it from working.
So my question is this: am I right in thinking that the battery rating of 12v 8000mAh means that this battery should technically be able to supply 8A for one hour? If this is the case, I'm going to ask the vendor for a refund as the battery is not supplying the power advertised. If this is not the case, how do I calculate what size battery I need rather than just keep buying more expensive and (more importantly) bigger and heavier 10000mAh batteries?
As an aside, I am planning to test the batteries by hooking them to heating elements that have known power requirements so I can see exactly how much current they will actually provide before they cut out as opposed to what it says on the label.