This is the english version of the user guide for 720is. There. There's als a "direct print user guide" and a "software user guide" that I haven't uploaded. If you want it I could upload it. Or another language...
A symbol wil blink to notify you that you should recharge.
But there actually is a better way if you want to see how much is left of the battery all the time. You could try out chdk(Canons Hacker Development Kit).
It adds a battery power function that tells the percentage left in the battery. It also adds a million other things. It is a firmware hack that is read from the sd card and that doesn't interfere with the original firmware(when you remove the card/erase the file on the card, the original settings and firmware starts up.
It can be a bit tricky to install but it's worth it if you want a lot of extra (dslr-like) photo operations like auto-bracketing, custom iso, 60 second exposures, raw capability and much more....
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