WARNING:

Button/coin batteries can cause severe injuries or even death when swallowed.
Keep batteries out of reach of children.
If you suspect a child has swallowed or inserted a button/coin battery, seek medical attention immediately
Item Description
Brand: PKCELL
May also be known as: DL2450, CR2450N, ECR2450, BR2450, BR2450-1W, KCR2450, LM2450, 5029LC

Model: CR2450 Button Coin Cell Battery

Capacity: 600mAh
Voltage: 3V
Chemical Composition: Lithium
Shelf Life: 5 years (not printed on battery)
Diameter:About  24.5mm / 0.96"
Height:About  5.0mm / 0.19"
Conversion : 1mm = 0.0393 inch
Application: Flameless Candles,tealight candles, tea lights,Clocks, Watches, Calculators, Dive Computer,Car Key Remote,Security System, key fob
Note: 
A: Some customers are confused about model number. 
Different callings. For example, CR2032 is also called 2032 or ECR2032 or DL2032. Actually they are the same.
B: Sometimes we hear from customers they bought wrong size for their devices. 
That's very understandable. Because those button cells are very small and look very very similar from pictures.
Voltage are all 3V. Material are all Lithium. The differences are dimensions.
 
Check below table with all models before you buy:
 

WARNING: BUTTON/COIN BATTERIES ARE HAZARDOUS. KEEP OUT OF REACH OF CHILDREN

Safeguard children by taking control of button cell or coin batteries.

  • Keep products with accessible batteries away from children if the battery compartments do not have a screw closure to secure them.

  • If the battery compartment is damaged, replace the product as soon as possible, repair or dispose of the product.

  • Toys with button cell or coin batteries are required to have a secure closure requiring a screwdriver, coin, or tool to open.

  • Check the toys in your home to make sure battery compartments are secured.
  • Do not allow children to play with or be in contact with button cell or coin batteries.

  • Call the National Battery Ingestion Hotline (800-498-8666) or the Poison Help Line (800-222-1222) immediately for treatment information if you suspect a child has swallowed or is exposed to button cell or coin batteries.

Datacaciques