Real World battery life means something totally different to different people. Thats why there is a standard. You can use the standard to compare life between cameras and have a good idea as to how they compare.
If I am out taking a lot of photos in a session, I usually get at least twice the CIPA rating, but if I tale a few a week, then I get a lot less.
There is a review on
"The Digital Picture" where Bryan posted this about his observed battery life.
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Battery
To reduce camera size and cost, the battery comes into focus as reducing the size of the battery can yield both. Logically, Canon opted for the
Canon LP-E17 Battery for the RP. I say "logically" because this is the same battery used in many of Canon's other small current-model DSLR and mirrorless cameras. Great is that multiple camera models can utilize the same backup batteries and a single charger can also be shared. Not as great is that smaller size can mean reduced capacity and the RP has an underwhelming battery life rating of approximately 250 images.
Few are going to be excited by that rather-low number, but real life experience usually yields considerably better results. The first battery I was handed with the camera (I don't know if it was fully-charged) gave me 224 images with the camera powered on and active (including the initial setup) for most of the four hours it lasted. The second battery provided 571 images in normal shooting scenarios.
This tiny battery takes up very little space in the camera bag or your pocket and it is advisable to always have at least one spare along.
The EOS RP provides a 4-level battery indicator and a recharge performance rating for the installed battery."