I just bought a second hand Mid 2012 Macbook pro 13".
In the description he described the battery as: "Battery Status - (96% Health) Normal with just 23 cycles." but as I've never had a macbook before, can someone tell me how many hours this would be? This seller has sold many macbook pros before so I don't think it should be too bad, but making sure.
Here is the picture of the battery:
http://gyazo.com/dab4b66100f18777288ddf73e219fcd5
Specifications for a new 2012 was around 7 hours of "wireless web" usage. You should get that or fairly close.
In regards to the battery health, you will probably find that the figure fluctuates a lot. Several of my notebooks have shown a smaller percentage of full charge capacity compared to design capacity. If you "relearn" the charging circuitry, you may see the full charge capacity increase and sometimes exceed the design capacity.
From the looks of that screen shot, you have nothing to be concerned about. Apple notebook batteries typically work very well from what I have found, and they are designed to still be at 80% performance at 1000 cycles.
In regards of draining and recharging it, about the only thing that will do to benefit you is to perhaps more accurately calibrate the battery circuitry and make the run time figure and percentage figure more accurate. It is not recommended to
completely drain these batteries and they do not suffer from memory issues like previous battery types did. You should be able to charge it when you need to and not be concerned about how low it is when you begin charging it or how long you charge it for. Just use a few basic guidelines-
When you are near AC power, run it off of AC power so it will have a full charge when you need to take it with you.
If you mainly use the product on a desk and almost always on AC power, it is recommend that you do run the machine on battery periodically to "exercise" the battery. Once per month, just use the machine on battery. When it gets low, connect it back to power. If will not kill your battery if you do not do this, but it could shorten its lifespan.