BP-511/BP-511a Battery Pack and USB Charger Compatible with Canon EOS 5D 10D 20D 20Da 30D 40D 50D 300D D30 D60 and G5 Pro 1 G2 G3 G6 G1 Pro90

Batteries should be charged once a month once they have been used. Take them off once they are charged. First try new ones before bothering with the camera. https://www.amazon.com/GKUGEYGO-BP-511-BP-511a-Battery-Compatible/dp/B0F4Q9H76T/ https://www.aliexpress.com/item/1005012377235558.html