I noticed that my main battery has a 56% capacity. It's Li-Ion chemistry.
Is there any trick to improve this capacity? I am pretty sure this model of battery isn't in production any more, it's a 4 year old computer.
Re: Battery Capacity
Search around on the net for battery places - you can almost always find a new one.
Also an old trick I've used a few times is freezing the battery for a few hours and then letting it thaw out. Usually jump-starts them at least for a short bit longer.