EFOY Pro fuel cell generators are smart energy producers that can be used to continuously and fully automatically recharge batteries. To do this, the fuel cell is connected directly to the battery that supplies consumers and monitors its charge level. The fuel cell recharges the battery fully automatically and then switches to standby - without any need for maintenance or intervention on the behalf of the user. To ensure longer autonomy without user intervention, a model with two cartridge connectors has been developed for both power classes of the EFOY Pro fuel cell - namely the EFOY Pro 800 Duo and the EFOY Pro 2400 Duo. EFOY Pro 800 Duo and EFOY Pro 2400 Duo are perfectly suited for installation inside a vehicle or mobile surveillance.