Oppo A71s has 3000 mAh Li-Polymer nonremovable battery. It lasts for almost a day with moderate usage.
No. Oppo A71s does not have the gorilla glass protection. But you can apply tempered glass for the added display protection.
Oppo A71s does have the LED notification light.
No. Oppo A71s does not have the hybrid sim card slot. Oppo A71s houses 2 dedicated MicroSD card slots and a dedicated MicroSD card slot.