May also be known as:DL2450, CR2450N, ECR2450, BR2450, BR2450-1W, KCR2450, LM2450, 5029LC. Model: CR2450 Button Coin Cell Battery. Chemical Composition: Lithium. Material are all Lithium. Toys with button cell or coin batteries are required to have a secure closure requiring a screwdriver, coin, or tool to open.