The battery has a large battery of 4,500 mAh. A phone well suited for your kids, or yourself if you need an extra phone.
From Amazon
Xiaomi 12X 15,9 cm (6.28") Double SIM Android 11 5G USB Type-C 8 Go 256 Go 4500 mAh Bleu
OnBuy
Xiaomi 12X 8 + 256GB 6.3 "5G Dark Gray ITA