Buy the iClever HS19S.

It is built for a kid's ears and a kid's head, and that beats a bigger battery every time.

What was compared

iClever HS19S Kids Headphones for School, Over-Ear for Toddler Boys Girls | SafeSound Tech... — $14.99
JBL Tune 510BT - Bluetooth headphones with up to 40 hours battery, microphone for call, fo... — $39.95

1. Protects hearing, the JBL can't limit volume
The HS19S caps output near 85dB to protect developing ears, per iClever's product specs. The JBL 510BT has no volume limit, so a toddler can crank it to full adult volume levels for hours.
2. Built to actually fit a small kid's head
iClever's over-ear cups and headband are designed around a child's smaller head, and reviewers call it comfortable for long school days. The JBL is sized for adults, and multiple reviewers call it uncomfortable and heavy on smaller heads.
3. A third of the price for gear kids destroy
At $14.99 against $39.95, the HS19S costs a fraction of the JBL, and toddlers lose, chew, and snap headphones constantly. Spending less on something that will get trashed in a school bag is just the smarter bet.
4. No charging schedule for a parent to manage
The HS19S plugs straight into a tablet with a cord, so there is no battery to forget to charge before school. The JBL needs charging management every few days, one more thing a parent has to remember for a child's device.
5. Yes, JBL has better battery and bass. Skip it.
The JBL's 40-hour battery and Pure Bass sound are real, built for older kids and adults who want wireless freedom. A toddler on a school tablet never uses that battery or bass, and losing the volume cap to get it is the wrong trade unless this is actually for a teen picking their own headphones.