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The 40W solar panel and charger can be used to charge a battery from a discharged state to a fully charged state. Once fully charged the charger shifts to a trickle charge/ float/ maintainer mode to prevent overcharging. (Overcharging can cause a battery to shed lead and lead dioxide, resulting in a decrease in battery's performance and life).The float mode ensures that the car battery is maintained in the fully charged healthy state, even if the car is left in the garage unused for many days. This also enhances the life of the expensive car battery by several months. A fully charged battery also means less strain on the alternator and the engine consumes less fuel thereby offering better mileage. It also ensures that your car starts on the first twist of the ignition key particularly in winters after returning back from a long vacation. The mono-crystalline silicon panel has good efficiency and the battery charger has low conversion losses. Together they charge the battery in a shorter time. The trickle charge mode with float voltage of 13.8 volts prevents water loss and prevents overcharging. The trickle charge mode ensures stability and reliability of the battery for a longer time.It is portable and convenient for charging the 12V rechargeable battery in case of emergency particularly when in remote locations where access to power sockets or electric grid supply is unavailable. It can be used for the charging of 12V batteries of cars, trucks, jet skis, motorbikes, tractors, all terrain vehicles, snowmobiles, boats and personal water sports equipment orRV so as to maintain the battery efficiency and prolong its service life.Solar Panel Type: Mono-crystallineWattage: 40WAmperage: 2.2ANominal Voltage: 12V Typical Operating Voltage range: 16-20VMaximum Open Circuit Voltage: 24VDimensions: 64X36X3 cmWeight:2.7 kgs.Car Battery Charger with LED Indicator : Nominal Output Voltage: 12VTrickle Charge Voltage: 13.8VMaximum Open Circuit Voltage: 14 VoltsPackage Contents:1 × 40W Solar Panel1 × 12V Car Battery Charger with LED Indicator1 × Set of two alligator clips (red and black) for Car Battery1 × Set of Cable, 1 meter long, with DC Power Plug 5.5 x 2.1 mm (Male)1 × (This) User Manual