Energizer CR2016 Lithium Batteries (15 Pack) - Long-Lasting Power for Watches, Calculators, Key Fobs & Medical Devices

I purchased this product for use in an LED dog collar light.Not expecting these to last any longer than any other brand of CR2016 batteries since these appear to be designed for very low power consumption items like a watch.Typically I find that with 20-30 minutes of use per day that they will last for about 30 days (+/-).If you are unhappy with these batteries, then I suggest replacing the device you use them in to something that does not use a CR2016 or other flat coin type batteries.Basically this type of battery is not really designed for items that require frequent or larger amounts of power, thus their lifespan is going to be disappointing.