kids syncup won't turn on despite charging for hours watch is a few weeks old. thx

Just bought a Gabb immediately had issues returned it because it wouldn't power on at all or charge.. now went to T-Mobile got the SyncUP kids watch and it was awesome starting it up yesterday but now battery is 34% never charged last night and has been still sitting at 34% for over an hour… what the heck is going on! All companies with kids devices are NOT working