You don't say what vehicle you have, so specific info isn't possible. A "check electrical system" indicator on the dash would normally mean the voltage is too low for some reason.
You could try cleaning the battery cable connections and make sure cable connections to be sure they are tight. If the battery isn't a sealed type, you could check the liquid level in each cell. If the level is low, add (preferably distilled) water to low cells. A significantly low liquid level in one or two of the cells could indicate a bad cell(s) requiring a replacement battery.
Also, check the alternator drive belt for condition and tension, as the belt could be slipping on the pulley and not charging the battery properly. If you have no training in using a volt/ohm meter and these prior mechanical checks indicate no problem, you can take the vehicle to a chain type auto parts store (if it is running) and get the electrical system checked for free. If it isn't running, you could remove the battery, and they can check it. Some parts stores can also check the alternator without it being installed in the vehicle.
If testing indicates a problem with the battery, alternator, or alternator drive belt, after replacing the failed part, it would be good to take the vehicle to the parts store to get them to check the entire system for proper operation. Testing the system could help avoid future problems.
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