You'll be fine as they're alkaline batteries. Lithium batteries in the cargo hold are very bad because a lithium fire burns insanely hot and doesn't respond well to normal fire suppression systems. In the event of a lithium fire in the cabin the device can be submerged in water to cool it which will eventually extinguish the fire.

(see this AVH report from last week about a lithium battery incident: http://avherald.com/h?article=49182334&opt=0)