F100 Product Registration Under Voltage At input an lama sounds, at 10.0V the inverter shuts down and the FAULT LED tums on. This protracts the battery from over For complete warranty coverage, please register your Duracell product within fourteen days of purchase. } Over Voltage tha input voltage is >15V, an slam sounds, the inverse shuts down to protect itself and the FAULT LED wil ruminate. Visit or scan the QR code below to register.