Is there a kids wearable with both long battery life and GPS?

Not meaningfully, and it is worth understanding why rather than hunting for one.

Continuous GPS and a cellular connection are the two largest power draws in any wearable. A device doing real-time location tracking is running a radio and a GPS receiver more or less constantly, which is why connected kids watches are measured in days rather than weeks.

If a product advertises both a month of battery and live location, look closely at how often location is actually sampled. It is usually far less frequent than parents assume, which changes what the feature is worth in an emergency. See our comparison of UAE options.