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Originally Posted by OfficerChan
Depending how many rounds I get through my battery, I should be able to determine just how damaged it is. Is my theory flawed?
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Those are very general numbers which can be affected by a whole wack of factors. Essentially the battery's life in an airsoft gun is dependent on how much "work" it has to do turning the motor. If you've got a heavily upgraded gun with torque up gears, then the motor is going to push a heavier load and thus draw down the battery faster. If the gun is stock, you'll get more life. If you have a crappy shim job in an upgrade, battery life could be horrid. So here is the problem - if you know what your gun 'generally' gets out of the battery, from experience, then you could use that as a measure. But, if you don't already have that baseline, it might be hard to blame it on the battery or the load its pushing because you just don't know.
There are ways to tell these things but they involve load meters (I have one that I use to test upgrades and power loads) and will tell you just how much power and amperage you're drawing when you pull the trigger, as well as the resting voltage and amperage. This information is the penultimate data you need to assess these things without putting a lot of rounds through the gun to establish a baseline and you can tell if its the load or the battery.
As Greylocks suggests, a multimeter will give you some information, but, thats only voltage. What you really need to know is how the battery behaves under load - that you cannot get from a multimeter - its possible to have a battery that shows a full voltage, but then the battery has no stamina and dies after a few heavy load draws.
As you can see the question you ask can be very complex in finding an answer for without the right equipment. BUT if you have a baseline and know your gun, you can extrapolate what your battery life *should* be based on past experience.