Yes,All lithium batteries have to be in your carry on technically…I’m sure some sneaks by but the regs do not allow them in the belly. They should have allowed you to remove the battery though and put it in your carry on. TSA ppl are weird though…there are very few that know the regs and every airport has their own way of doing things.
WAKE UP People!! One guy just lost $550!! If you get a PHONE Text from someone claiming to be a SELLER, Do NOT SEND MONEY!! NEVER put your phone number in ANY post. Scammers pretend to be Sellers! Contact Real Seller via PM. NEVER EVER send a penny without a VOICE phone call with seller and demand custom photos.