Eaton's KW and KVW families of supercapacitors replace button cell batteries (and the battery holder) for real-time clock backup power, and provide ridethrough for battery operated devices to allow time for battery replacements. They are fully rated at industrial temperatures from -40 °C to +85 °C.  The KW is rated at 5.5 V while the KVW family is intended for consumer and light industrial applications with 5.0 V rating. Both families can be operated at lower voltages than rated. All products are RoHS compliant.