There are reputable 3rd-party batteries out there: for example, Small Rig, Kingma, Wasabi are three I can think of. Beware of buying from sites other than reputable camera stores.
Batteries have a limited number of charges to them, and you can reduced that frequency of charging by turning off things that drain the battery, such as continuous focus (as opposed to servo), Wi-Fi and Bluetooth, GPS (if available). Also how much you review images after shooting. Also, do not leave the battery in the camera when not shooting, it can continue battery drain and is not recommended by Canon.
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
