It depends on the type of battery rather than the camera. If you look at the battery it will tell you the type lithium ion, nickel cadmium etc. Then you can read about the battery type and see how to keep it in optimal condition.
Thing is, a new battery for the powershot is is about $30.
At this price point, just go for it, go shoot, go enjoy the camera and buy a new battery if/when it becomes a problem.
Also, the camcorder percentage may be a numeric read out but it is only marginally more accurate than the bars displays. The calculation to find the remaining capacity is based on the voltage and known discharge rate for that battery. To give a tangible feel, think of a water cooler, when the water tank is full, you open the tap and the flow is strong. As the water tank empties over time, then there is a drop in that rate of flow - not noticeable at first but if you compare when the tank is full vs when the tank is running low, then you can see it. This is the a loose comparison to measuring the voltage coming off the battery and comparing it to a known discharge curve - there are better more accurate ways but for most electronic devices it is this simple calculation to give a rough estimate.
What is true regardless - coming back to the example, if the tank runs dry completely, then that isn’t good -people get thirsty. Most rechargeable batteries dont like being completely discharged. In fact the battery for my fathers mobility scooter went completely flat last month and we had to buy a new one.
The batteries in my i3 car in the literature, state optimal battery life is had when the charge is typically kept in between 20-80%
Fun times are had when you buy a battery for a camera and the manufacturer has changed the capacity. I have an old-ish camera here and the batteries are not cheap. It takes gorgeous images worth tolerating the hiccups for- those who know me probably know what I am talking about - anyway, I bought some spare batteries for it and it’s “sister” so I had spares. The thing is, the battery has slightly more capacity than the original - good thing right? Well no, thanks to some wonky maths and no firmware updates in years, the software in the camera interprets these new batteries as having only 25% capacity when they are full. So, fun and games when you are out and about and the camera is crying out battery low. Takes cojones of steel for an OCD stress monkey like me to push on through that message every time you take a shot. When the battery charge drops down low enough that the wonky maths starts to work again, then the camera stops panicking about charge. Lol… the things we do for this bloody hobby eh!?!?