The AEC12-12-30 EV charger maximises the range of the vehicle by fully charging the auxiliary battery when the traction batteries are being charged and while driving it only tops up the auxiliary battery in defined necessary situations . This is all to maximise the range from the traction battery. The AEC12-12-30 can use EV ECU signals ,EV chassis battery voltage levels, an Ablemail AES-001 Advanced AC/DC charging detector, a CAN interface signal or any available mains charging indicator signal to ensure the auxiliary battery is fully charged while the charging of the vehicle traction batteries is completed. The AEC12-12-30 has been designed to charge up to 300Ahr of most battery types including AGM, GEL, Flooded and LITHIUM. A bluetooth module is built into the charger so battery selection and programme configuration can be carried out using a Android or IOS mobile device & the Ablemail Device Manager App . The AEC12-12-30 then only charges the auxiliary battery in an emergency situation or to a specific state of charge percentage when driving or parked (without vehicle mains charging) in order to have no / minimal impact on range. The programmeability of the AEC12-12-30 means it can be optimised to solve the issues of auxiliary 12 Volt DC battery charging on full electric and electric hybrid vehicles in most installations. This AEC12-12-30 works with electric vehicle AC chargers & rapid vehicle DC chargers and for most applications a single AES-001 sensor located on the battery charging feed is sufficient .