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Your Mark III battery will get you through a lot of shooting on a single charge, but your battery will wear out over time. You can get some status info about your battery by going here to the Battery info. command, which is on the third page of the setup menu. This gives me a few different pieces of data. First, it tells me the name of my battery; the type of the battery, which is an LP-E6. So if you're at the camera store, or going online to order a new battery, that's what you are going to want to order. It tells me that currently my battery has 27% of its power remaining, and I have taken 20 pictures with it.
Now, this is not a total running shutter count. If you are looking for the total number of shutter actuations that you have on the camera, because maybe you want to sell it or something, this is not how you're going to get it, because this number is reset every time you recharge the battery. It also tells me what it thinks about its recharging performance, and this is a scale of one to three. So right now, it's saying that performance is very good, which is to be expected, because it's a brand new battery. When it gets down to just the leftmost bar, Canon recommends that you buy a new battery.
You are not going to harm your camera using an old battery; you are just going to find that the battery doesn't last very long, and so that's a good indicator that maybe it's time to go shopping for a new one. Canon really recommends using Canon brand batteries. They'll tell you that you'll damage your camera if you use a third-party battery. I have never heard of anyone damaging their camera with a third-party compatible battery. They are much less expensive. The ones that I've used have very high capacity, and work very well. Notice that they do not respond to the Battery info. page; the Canon camera cannot read third-party batteries.
So, the choice is up to you. Either way, this screen gives you a good idea of letting you know when it's time to go battery shopping.
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