Hi Andrew & Penny,
Thanks for contacting us regarding the issues you having with battery performance on your children's phones. I have noted some info below that I think you will both find useful.
I have noticed in the screenshot you have sent through to us, that quite a few things have been left on in the background, including Bluetooth and NFC. To help ensure battery life, please make sure your child is closing apps and turning off services when they are done with them.
Another option is the Family Zone box, a wireless access point you can install in your home that broadcasts a wireless network that is controlled and filtered based of your settings in your Family Zone account. When a device connects to the Family Zone network the Mobile Zone application turns off and is instead filtered through the box.
If you have further questions about battery life and the Mobile Zone application, please call us on 1300 398 326 and ask for Zac.